Dupuyer, Montana, sits in USDA hardiness zone 4b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
A short list that earns its place here — cabbage, cranberry, cilantro, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Dupuyer, no two yards are alike.
A low spot, a south-facing slope, or a stand of trees moves the frost date and sun across a single Dupuyer lot. Enter your address and we'll score 1,086 plants against your land's actual soil, sun, and frost.
We read public map data around Dupuyer — soil, climate, flood, and parcel records. How we handle your address.
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Dupuyer — the short answer
Dupuyer, Montana: USDA zone 4b, about 148 days between hard freezes, across 3K acres of town.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~148
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 3K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 4b is Dupuyer's average, not your lot's — a low corner or a tree line moves it. Against Dupuyer's 148-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Dupuyer
Each reading below is measured for Dupuyer itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredDupuyer runs about 148 days between hard freezes — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredDupuyer sits in USDA hardiness zone 4b.
The zone sets which perennials, shrubs, and fruit trees live through an average winter here — a plant rated for a colder zone is a safe bet, one rated warmer needs winter protection or gets treated as an annual.
Match perennials and fruit to the zone before you buy, so nothing you plant is a gamble against the cold.
USDA PHZM 2023
The kind of country Dupuyer is in
Dupuyer sits in the Northwestern Glaciated Plains — EPA Level III, inside the wider Great Plains. That is read at Dupuyer's own centroid rather than borrowed from Pondera County.
What Grows in Dupuyer
Every plant below cleared Dupuyer's own zone 4b and its 148-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Dupuyer?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Apr 8; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 1 — long-season crops need about 90 days of runway, quick greens only 30. Even here the calendar’s edges hold value: thirty-day greens late in the window, then garlic and a rested bed for spring.
What's on the federal record near Dupuyer
Closest first, within ~10 miles of Dupuyer. Listing isn't leaking, and distance isn't exposure.
- MALMSTROM AFB T 50Underground Storage Tanks · 1.4 mi
- MERCURY EXPLORATION CO MONTANAUnderground Storage Tanks · 1.4 mi
- BILLS RANCH COUnderground Storage Tanks · 1.4 mi
- MALMSTROM AFB T 48Underground Storage Tanks · 1.4 mi
- MALMSTROM AFB T 49Underground Storage Tanks · 1.4 mi
- MDOT DUPUYER OLD POST OFFICEUnderground Storage Tanks · 1.4 mi
- MDOT DUPUYER SITEUnderground Storage Tanks · 1.4 mi
- ROCKY MOUNTAIN MOTOR SERVICEUnderground Storage Tanks · 1.4 mi
- JOHN WHETHAMUnderground Storage Tanks · 1.4 mi
- BIRCH CREEK COLONY-TREATMENT PLANTCAFO · 4.5 mi
- PONDERA COLONYCAFO · 4.5 mi
- 28N06W03CBBC01Nitrate · 5.0 mi
4 more sites are on the record inside the same radius. See them on the map
Measured from Dupuyer's center, not your beds. Run your own address for what's upwind of you specifically.
Environmental Intelligence
The counts behind that headline — every source type on the record near Dupuyer.
Total Sites
18
within ~10 miles of Dupuyer
Risk Level
Low
Highest-severity
4 concentrated animal feeding operations
Sources Checked
within ~10 miles of Dupuyer
Severity Distribution
within ~10 miles of Dupuyer
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Large animal operations push nitrates and bacteria downstream. Below one, test your water.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
Check your specific parcel in Dupuyer
Get exact proximity distances to contamination sources for your specific parcel — plus soil, sun, drainage, and 1,086 plant recommendations.
25+ data sources read at your address, not the Dupuyer average
Your land is one point inside Dupuyer
Everything above resolves to Dupuyer as a whole — one PHZM band and one 28°F frost record, read across 3K acres. Your parcel is one point inside that footprint. Slope, tree cover, a low spot that pools cold air, and what is in the soil are all resolved at the address, and none of them are visible at town scale. That is the honest boundary of this page, and the reason the next step is a reading of your own ground rather than a better local average.
Your Lot vs the Dupuyer Average
Dupuyer Average
- ●USDA Zones 4b, averaged across Dupuyer
- ●One soil character for all of Dupuyer
- ●Frost dates read at Dupuyer's scale: May 6 to Oct 1
YOUR Parcel
- ✓Your exact zone, not Dupuyer's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Dupuyer
Pull a site-specific report for your exact address in Dupuyer, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Dupuyer averages can't show:
We read public map data around Dupuyer — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Dupuyer average
How we know this about Dupuyer
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Dupuyer’s own record; boundaries and acreage from US Census TIGER/Line 2025; the contamination records from the federal sources named in their beats above. Soil is not read at town grain anywhere on this page — there is no town-resolution survey in our data, which is why you will find no soil grid here rather than a statewide one wearing a local label. The resolution ledger below names every figure this page inherited.
Common questions about Dupuyer
When does frost risk typically end in Dupuyer?
The last hard freeze (28°F) in Dupuyer typically lands around May 6, per NOAA 1991–2020 climate normals — earlier than the light-frost dates most charts quote. That marks the hard freeze, not the last light frost — lighter frosts keep biting past it, which is why tender transplants here wait until about May 27.
When is the first frost in Dupuyer?
The first hard freeze (28°F) in Dupuyer typically arrives around Oct 1, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 17, so the watching starts about Sep 1 — about 148 days after the spring freeze cleared.
How long is the growing season in Dupuyer?
Measured between 28°F hard freezes, Dupuyer sees about 148 frost-free days — roughly May 6 through Oct 1, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 27 to Sep 17, about 113 days.
Is the soil safe to grow vegetables in Dupuyer?
The federal record around Dupuyer is light — 18 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (10), the nearest Underground Storage Tanks record about 1.4 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do gardeners stretch the season in Dupuyer?
With about 148 frost-free days between hard freezes, Dupuyer rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 176 to 204 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 6 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Dupuyer's scale — its 4b band and its 148-day season. Your yard writes its own version of Dupuyer's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
What this page reads at Dupuyer’s own scale
6 of the readings below were taken at Dupuyer's own scale — its own ~148-day season between 28°F freezes, the 2,975 acres it covers and 18 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Dupuyer's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Dupuyer's own 28°F hard-freeze dates, about May 6 and Oct 1 and the ~148-day span between themNOAA 1991–2020 Climate Normals
- 18 documented contamination sites on the federal record near Dupuyer, the closest Underground Storage Tanks record about 1.4 miles out from the town centreFederal environmental registers
- Dupuyer's boundary and the 2,975 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~148-day seasonGrowable Ground crop-matching engine
- The ecoregion at Dupuyer's own centroid, the Northwestern Glaciated PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Dupuyer's 2,975 acres read through its county's SSURGO summaryfrom Pondera County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Pondera County
- The growing challenges every Montana grower plans around — written at state scale, so they stay on the state guidefrom Montana
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Pondera County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Dupuyer's 2,975 acreswhy one lot differs from the next →
- Which side of Dupuyer you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,975 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 1.4 miles out, measured from the town centrehow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — measured at your address, and averaged away by any Dupuyer-wide figureread your own land →