Montana Dryland Winter Wheat Planting Outlook

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What this tool does

Compares dryland winter-wheat planting dates using your field checks, mapped soil, weather forecasts, and 30-year climate history. It shows tradeoffs; it does not choose a planting date for you.

DATAWeather · soil · 30-year climateNOAA GFS, USDA SSURGO, Daymet, nearby observations, and seasonal climate context.

YOUR CHECKSSeed moisture · seed depth · green bridge · moist profileField observations stay separate from regional/model data and can remain unknown if not checked.

CALCULATESWater change · soil temperature · fall growth · water planningAlso shows temperature-only emergence references and dry/normal/wet water-planning values.

OUTPUTDate tradeoffs · water context · management resourcesShows nearby-date tradeoffs, water-planning context, and planting-management resources.

How to use itFour steps from field selection to planting setup.

1Find your fieldSearch, zoom, pin

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2Check the seedbedDepth, moisture, green bridge

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3Choose a dateSep–Oct planting window

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4Compare & adjustEarlier/later · water planning · management resources

Ready to begin?The map and live data load after you start.

Loads the latest field, soil, weather, and climate data.

Step 1 · Field + planting setupMap on the left · field checks on the rightNo field selected

STEP 1 · SELECT YOUR FIELDSTEP 1 · YOUR FIELD

Pin your field and see field-specific planting conditions.

Search an address, city or ZIP, then zoom to the exact field. Add field checks only if you know them.

START WITH YOUR FIELD

Pin your field location to see today’s conditions, mapped soil, and planting-date tradeoffs.

Search by address, city or ZIP. The map switches to satellite view so you can zoom in and place the pin on the correct field.

FIND YOUR AREASearch by Montana street address, city, ZIP code, or latitude/longitude.After a match, the weather colors turn off and satellite imagery opens for precise field selection. Pan/zoom, then click the exact field.

Choose the map layer & dateSwitch among seed-zone water, profile water, soil temperature, and fall thermal opportunity.−

Dec 15 horizon

Loading data…14-day window rolls forward daily

For planting:Select a parameter above to see its planting meaning.

ACTIVE MAPSeed-zone moistureToday

FIELD LOCATIONSearch an address/city/ZIP or click the map to zoom closer.At a close field view, click once to place the field pin.

PIN FIELDZoom/pan · click exact field

Loading regional weather fields…

Regional weather screening surface; zooming improves field-location precision but does not increase weather-model resolution. Hover for coordinates/value. Gold teardrop = selected field. Basemap: Esri World Imagery.

SOIL PROFILE & WATER STORAGEMapped soil below the field mapUSDA SSURGO mapped horizons + field or modeled PAW + model water context

Pin a field to load the soil profile.Mapped horizons, available-water capacity, and water context will appear here.

YOUR FIELD INFORMATION

Planting date and field checks

Enter only what you know. The tool will not guess missing field conditions.

Pin a field

Selected dateSelect a field first

Change date

FIELD CHECKSSeed depth, moisture and volunteer cerealsSeed depth, moisture and green bridgeThese field checks matter more than a model value alone.

Quick field-check helpProbe 2–3 spots and use a simple feel check.+

ABOUT 1 MINUTECheck 2–3 representative spots in the seed row.

USDA feel guide ↗

Find the moist layerUse a soil probe, narrow trowel, or spade. Record the first depth where soil stays consistently moist—not one damp pocket.

Feel the planned seed depthSqueeze a small sample. Dry soil stays loose or powdery; moist soil holds together and feels clearly moist; wet soil is sticky, smeary, or glistening.

If the field is variable, check more than one spot and enter the typical condition.

Planned seeding depthChoose the depth you expect to use. Keep placement as shallow as practical while reaching reliable moisture. At what depth do you first find continuous moisture?Check 2–3 representative spots and choose the typical depth. Will seed-zone moisture last? Advanced field checkOptional advanced observation for false-start interpretation. Living volunteer cereals / grassy hostsVolunteer cereals / green bridgeLiving hosts can carry disease into newly planted wheat.Living hosts can override otherwise favorable conditions.

How deep is the soil profile currently moist? Optional · improves PAW estimate

If you know it, enter the typical moist depth from several probe/auger checks. If left blank, the tool uses a lower-confidence modeled PAW estimate from the preceding ~125 days of weather plus SSURGO capacity.

How do I measure this?

Use a soil probe or auger at several representative spots. Record the approximate depth from the surface to which the profile remains moist. This is different from the shallow depth to first continuous moisture used for seed placement.

Enter this once. The same field check is used in today's guidance, nearby-date context and planting adjustments. You can edit it anytime.

Optional field details

Seedbed surface today OptionalOptional context for emergence through the surface. It does not set seeding depth or the planting verdict by itself. How does soil feel at the planned seed depth? Field aid

Soil-moisture feel cues update after mapped surface texture loads.

Variety ability to emerge from deeper seeding Depth checkDeep planting is riskier for varieties that emerge poorly from depth. Residue cover Context Previous crop Context Surface condition Context

Why do these inputs matter?

Planting dateSets the forecast lead, remaining fall thermal opportunity and regional disease-timing context.

Planned seed depth + moisture depthShows whether the intended placement reaches continuous field moisture.

Seedbed conditionToday’s surface condition helps describe what the seedling must emerge through.

Living volunteer cerealsAn important safety check because living grassy hosts can carry disease into newly planted wheat.

Moisture persistenceAn optional advanced observation used with modeled drying to flag a possible false start.

Pin a field to continue.The planting date defaults to today. Unverified field checks can remain marked “Not checked,” but the outlook will keep them visible as unresolved.

How Was This Map Made? Data, Interpolation, Sources & Limitations

TODAY’S CONDITIONSSTEP 2 · YOUR FIELD TODAY

What do today’s conditions mean for your planting plan?What do conditions mean for your planting date?

Start with the short field message and your soil. Open the data only if you want to see why.Start with three separate checks: planting safety, whether the stand can start, and how much fall thermal development opportunity remains.

Today’s model snapshotSelect a field to load today’s values.

Know your soilMapped soil information will appear after a field is selected.

Show detailed evidence + data qualityOpen all six model/weather indicators, establishment-runway context, provenance and quality-control checks.View evidence ↓

Evidence for this dateModel values, sources, and data quality

Open this when you want the numbers behind the date summary.

Select a field, then choose a planting date.

Data quality & technical checksRecent water response, forecast agreement and research-only diagnostics

Recent water validationPin a field to compare the last 7 days of modeled precipitation with modeled soil-water response.

STEP 2 · YOUR PLANTING DATE IN CONTEXTSTEP 4 · NEARBY PLANTING DATES

What changes by your planting date?How do the conditions change around your planting date?

Compare today with your selected date, then see the simple tradeoff of moving up to 7 days earlier or later.Compare nearby dates. A different date may help one condition while making another less favorable.

Select a field and intended date.The 14-day comparison will appear here.

Want to check a specific date?Use the comparison below. Click any date to open that day’s exact conditions. Your selected planting date does not change unless you choose “Use this date.”

PLANTING-DATE COMPARISONDates within 14 days of your selected planting dateYour selected date is highlighted. Seed-zone and profile-water values are shown through Day 7; later water values are withheld while temperature and fall-development context continue.

Select a field and planting date to load the Planting Window Finder.

See exact daily values & technical evidenceClick a date in the comparison above to open its exact conditions here. The full Sep–Oct calendar remains available if you want every planting date.+

Detailed evidence:The date you clicked is shown below with exact values. This inspection does not change your intended planting date.

30-year contextSelect a field and intended planting date.

See supporting weather & 30-year climate plotsOpen the 10-day history, Day 1–7 soil-water guidance, full 14-day temperature/atmospheric forecast, 30-year context, exact values, and data sources.+

SUPPORTING WEATHER & CLIMATE DATA

Weather, model, and 30-year climate data

Use these plots to see the weather and model values behind the planting-date comparison.

MODEL BASELINE FOR COMPARISONTechnical values used to compare future dates

Pin a field to see the current safety gate and best next action.

Pin a Montana field to load the selected-coordinate forecast and nearby observed context.

DETAILED MAPPED SOIL EVIDENCEUSDA SSURGO technical context at the pinned coordinate

USDA soil-survey information will load after a field is pinned.

STEP 3 · NEXT-SEASON WATER CONTEXT

Water planning context

Compare dry, normal, and wet water-supply years using current profile water and historical May–July precipitation. These values are planning references, not yield forecasts.

MSU Extension water-productivity method · 4.2 bu/ac/in

Typical historical yield for this field Optional

bu/ac

One optional number. Used as your field-performance benchmark so the dry, normal, and wet year values can be compared with what this field usually does.

PAW method will be identified here.The tool switches automatically between the preferred field-informed pathway and the modeled fallback.

Pin a field to calculate mapped profile capacity.If moist-profile depth is entered, the field-informed PAW estimate is preferred. If it is blank or not checked, the tool uses a modeled FAO-56/Lollato-style water-balance estimate and labels it lower confidence.

Next crop-year contextPin a field to summarize spring starting soil moisture, expected rainfall, winter snow/recharge, and drought/ENSO context.

See supporting climate data & sources30-year May–Jul precipitation plot, seasonal precipitation/snow context, and source links.+

Pin a field to load supporting climate data.

How is this calculated? Method, assumptions & references

PAW source: if you enter moist-profile depth, SSURGO horizon AWC is integrated through that field-observed depth. If you leave it blank or choose not checked, the tool runs an initial-condition ensemble over the preceding ~125 days using the FAO-56 dual-crop-coefficient water-balance structure and the Lollato et al. (2016) winter-wheat sowing-PAW approach. This modeled pathway is lower confidence because the published Ze/Kcb calibration was developed in the southern Great Plains and has not been independently calibrated against Montana field PAW measurements.

Dry year / Normal year / Wet year planning values: the tool uses the MSU Extension water-productivity approach: current PAW + historical May 1–July 31 precipitation, multiplied by the winter-wheat crop-water-productivity value of 4.2 bu/ac/in. The card now shows one central value for each planning context instead of broad overlapping ranges.

Typical field yield: if you enter one typical field yield, it is used only as a practical field benchmark. The tool no longer adds a separate +5% planning goal in the main yield card.

Important fall-use limitation: winter recharge is still unresolved in September/October. The output is therefore a preliminary water-planning context, not a harvested-yield forecast. Seasonal precipitation/snow, drought, and ENSO remain supporting context and are not multiplied into yield.

MSU Extension · Water Productivity of Montana Crops ↗ · Agronomy Journal · PAW at sowing ↗ · FAO-56 water balance ↗ · NOAA CPC seasonal outlooks ↗ · U.S. Drought Monitor ↗ · NOAA CPC ENSO status ↗

STEP 4 · PLANTING ADJUSTMENTSSTEP 4 · PLANTING ADJUSTMENTS

Adjust the setup to the seedbed you actually find.Adjust the setup to the seedbed you actually find.

The short field-specific setup appears first. Open the full comparison table only if you want all scenarios and references.Use the field condition you see at planting. Do not change the drill setup from the map alone.

ACTIONABLE

Your field check will appear here.Enter it once beside the map; edit only if the field condition changes.

Pin a field and complete the field check to see the matching setup guidance.

Full planting-adjustment guide & referencesOpen the detailed seed-depth, seed-rate, placement, residue, fertility, and seed-treatment guidance with source links.Open guide ↓

For planting:Use the column that matches what you actually find at seed depth. Do not change seeding depth or rate from the map alone.

How these management categories were developed

These are tool-created field-management classes, not published named categories. Dry, marginal and favorable conditions come from field checks at intended seed depth; the Wuest–Lutcher water-potential values remain literature context only. Deeper Moisture Confirmed requires an actual field check and follows MSU depth guidance. Wuest & Lutcher ↗ MSU Guide ↗

Management AdjustmentCompare across planting conditions	Dry / Dust-InProtect establishment	Deeper Moisture ConfirmedReach moisture carefully	Favorable SeedbedUse the standard setup
Category	Dry / powdery at intended seed depthLiterature context: increasingly incomplete germination near/below about −1.6 MPa.Wuest & Lutcher ↗	Normal seed zone dry; usable moisture confirmed deeperRequires a field check—do not infer moisture depth from the map.MSU ↗	Moist at intended seed depthLiterature context: rapid germination above about −1.1 MPa.Wuest & Lutcher ↗
Seed depth	1–2 inDust-in if the fall window is closing; do not automatically chase absent moisture.MSU ↗	Only as deep as needed; ≤3 inConfirm moisture first.MSU ↗	1–2 in into moistureMSU ↗
Cultivar / emergence	Locally adapted cultivarStandard emergence ability at normal depth.	Favor proven deep-emergence / longer-coleoptile abilityRht8 is not required.Agronomy Journal ↗	Locally adapted cultivar
Seed rate	0.7–0.9 M PLS/ac baselineDo not increase for dryness alone.MSU ↗	Start with baselineIncrease only for delayed planting or expected stand loss.MSU ↗	0.7–0.9 M PLS/ac15–21 seeds/ft² dryland baseline.MSU ↗
Seed-row fertilizer	Be conservative10 lb/ac N + K₂O is a starting safe rate; dry/coarse soil may require less.MSU Soil Fertility ↗	Be conservative at depthUse the same starting-safe concept; actual safety depends on soil and opener geometry.MSU Soil Fertility ↗	10 lb/ac N + K₂O starting safe rateAdjust for soil, moisture, opener width and row spacing.MSU Soil Fertility ↗
Seed treatment	Strongly considerDry-seed-decay protection is finite.MSU ↗	Recommended as appropriateMatch product to labeled disease risk.MSU ↗	Match seed and field disease riskMSU ↗
Equipment / drill	Verify penetration + seed–soil contactHard, dry soil may require setup changes; extra packing cannot replace moisture.Nebraska Extension ↗	Hoe / deep-furrow opener may helpSlow down, verify actual soil cover, and keep Montana placement ≤3 in. Nebraska ↗MSU ↗	Standard calibrated setupMaintain uniform 1–2 in placement and good seed–soil contact. MSU ↗Nebraska ↗
Main caution	Emergence may depend on subsequent rainfallDo not mistake a dry model screen for a measured field condition.	Deep placement can delay or reduce emergenceAgronomy Journal ↗	Favorable moisture does not remove WSMV, crusting or profitability risk

Thresholds & Technical ReferenceOpen only when you want the benchmark numbers and source details.

Metric	How to read it	Key benchmark	Source
Seed-zone water · 0–4 in	GFS VWC is model context only. The grower field check at intended seed depth is the primary germination-water evidence.	Literature context: > −1.1 MPa rapid germination; −1.1 to −1.6 MPa slower/marginal. The tool does not derive field ψ from GFS + SSURGO.	Wuest & Lutcher 2013 ↗
Soil temperature · 0–4 in	Within the published range, warmer soil generally speeds emergence.	41–68°F (5–20°C): controlled emergence-response range used for context; outside it, no score is extrapolated.	Lafond & Fowler 1989 ↗
Conditional thermal emergence window	MSU air-temperature GDD reference is shown independently of model VWC; moisture must be field-confirmed before interpreting it as emergence expectation.	257–320°F-d, base 32°F. For future dates it remains a thermal reference until field moisture is checked.	MSU GDD MontGuide ↗
Fall thermal opportunity	Remaining base-32°F GDD from after a candidate planting date through Dec. 15. More GDD means more temperature-driven development opportunity, not automatically a better planting date.	Use with field moisture, WSMV timing and seedbed condition. Dec. 15 is a fixed late-fall comparison endpoint, not a biological dormancy date. Published GDD bands are temperature references, not predicted field stages.	MSU GDD MontGuide ↗
How to interpret the thermal number	<257°F-d median: limited thermal opportunity relative to the published lower emergence reference. 257–335: median reaches emergence reference. 336–695: median reaches the lower two-leaf reference. ≥696: median reaches the lower first-tiller reference.	These are thermal-reference crossings only. Actual development requires moisture and successful establishment; late or dormant seeding can still establish later.	MSU GDD MontGuide ↗ MSU Wheat Production Guide ↗
Emergence thermal context	Compares remaining base-32°F thermal opportunity with the MSU 257–320°F-d emergence reference. The statewide map shows the median margin above or below the 257°F-d lower reference.	Temperature only. This does not predict emergence or crop stage. Moisture, seeding depth, crusting and seed vigor are not included; two-leaf and first-tiller references remain provisional for fall-planted winter wheat.	MSU GDD MontGuide ↗
Profile water reserve (0–39 in)	+ = modeled storage gain vs today; − = modeled storage loss.	Reserve/rooting context after emergence; not the germination trigger and not field-measured PAW.	Lollato et al. 2016 ↗
7-day atmospheric moisture balance (P − ET₀)	+ = precipitation exceeds reference ET₀; − = atmospheric demand exceeds precipitation.	Context only—not soil recharge, crop ET, runoff, drainage or soil-water change.	FAO-56 ↗
Wheat streak mosaic timing	Avoid early planting and remove the green bridge; field conditions override the calendar.	General MSU guide: plant after Sep 5 north, Sep 15 central, Sep 20 southeast; kill volunteer cereals/grassy hosts 2–3 weeks before planting. Select a field and date for local status.	MSU Cereal Viruses ↗ MSU WSMV IPM ↗

Why Dec. 15? It is a fixed late-fall comparison horizon so every candidate date is evaluated to the same endpoint. It is not a dormancy date. The tool no longer turns MSU's roughly 4–6 weeks of fall growth into a grower-facing cutoff using an unvalidated 40°F endpoint. MSU Wheat Production Guide ↗

Fall wheat development · quick field guideGermination → emergence → leaves → tillering. Morphology reference only; not a predicted stage.Open quick guide

Use representative plants. Count fully unfolded leaves and tillers separately; dig plants when seed placement, roots, coleoptile or crown position matters.

Guide only. Select a field and planting date to highlight the conditional thermal references.

Field-staging notes & published references

1Sample representative plants

2Dig plants when needed

3Count unfolded leaves

4Count tillers separately

USDA-ARS winter wheat visual guide ↗GRDC Zadoks guide ↗AHDB Wheat Growth Guide ↗NSW DPI guide ↗MSU Montana Wheat Production Guide ↗

Use of outside-Montana guides: morphology and staging concepts only. Montana management recommendations continue to use MSU/Great Plains sources.

SCIENCE, DATA & DOCUMENTATION

How this tool is built

Datasets, field inputs, equations, model parameters, output logic, uncertainty, references and acronyms. Open only the section you need.

Methods & sources

1 · Data sources & live source links

2 · User inputs & automatically supplied inputs

3 · Methods, equations & model parameters

4 · How each major output is constructed

5 · Validation status, uncertainty & limitations

6 · References

7 · Acronyms & statistical notation

MORE HELP

Montana State University resources

Open the topic you need next.

Montana Wheat Production GuidePlanting, development, fertility, disease and management guidance. Fertilizer Recommendation ToolMSU fertilizer recommendation from soil-test and crop-management inputs. Seed Rate CalculatorCalculate seeding rate from target stand, seed weight, germination, purity and mortality. Statewide Winter Wheat Variety SelectionCompare Montana variety-trial performance across sites and years. Wheat Streak Mosaic GuidanceGreen-bridge, volunteer-cereal and planting-timing guidance for wheat streak mosaic risk management.

Live data diagnostics

Not run yet.