Sand Coulee, Montana, sits in USDA hardiness zone 4b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Growers here do well with cabbage, cranberry, turkish rocket, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Sand Coulee, 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 Sand Coulee 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 Sand Coulee — soil, climate, flood, and parcel records. How we handle your address.
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Sand Coulee — the short answer
Sand Coulee, Montana: USDA zone 4b, about 162 days between hard freezes, across 2K acres of town.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 8
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~162
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 2K 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 Sand Coulee's average, not your lot's — a low corner or a tree line moves it. Against Sand Coulee's 162-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sand Coulee
Each reading below is measured for Sand Coulee itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSand Coulee runs about 162 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSand Coulee 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 Sand Coulee is in
Sand Coulee sits in the Northwestern Glaciated Plains — EPA Level III, inside the wider Great Plains. That is read at Sand Coulee's own centroid rather than borrowed from Cascade County.
What Grows in Sand Coulee
Every plant below cleared Sand Coulee's own zone 4b and its 162-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Sand Coulee?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Apr 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 29 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 8 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
What's on the federal record near Sand Coulee
Closest first, within ~10 miles of Sand Coulee. Listing isn't leaking, and distance isn't exposure.
- MINERS MERCANTILEUnderground Storage Tanks · 2100 ft
- BIG STONE COLONYCAFO · 0.8 mi
- TRACY BARUnderground Storage Tanks · 1.0 mi
- HILL TOP COLONYCAFO · 1.6 mi
- MALMSTROM AFB I 2Underground Storage Tanks · 3.2 mi
- AMERICAN BARUnderground Storage Tanks · 3.2 mi
- KLASNER OIL COUnderground Storage Tanks · 3.3 mi
- 20N05E29ABBC01Nitrate · 4.7 mi
- MALMSTROM AFB A 9Underground Storage Tanks · 5.0 mi
- L JOHNSON INCUnderground Storage Tanks · 5.6 mi
- 20N04E31BCAC01Nitrate · 5.9 mi
- NORTHWEST EQUIPMENTBrownfields · 6.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sand Coulee'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 Sand Coulee.
Sources Checked
within ~10 miles of Sand Coulee
Severity Distribution
within ~10 miles of Sand Coulee
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sand Coulee, CAFO runs higher than the national average — 4 sites within ~10 miles of Sand Coulee. That's not a problem with your land — it's information about it.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Sand Coulee
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 Sand Coulee average
Your land is one point inside Sand Coulee
Everything above resolves to Sand Coulee as a whole — one PHZM band and one 28°F frost record, read across 2K 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 Sand Coulee Average
Sand Coulee Average
- ●USDA Zones 4b, averaged across Sand Coulee
- ●One soil character for all of Sand Coulee
- ●Frost dates read at Sand Coulee's scale: Apr 29 to Oct 8
YOUR Parcel
- ✓Your exact zone, not Sand Coulee's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sand Coulee
Pull a site-specific report for your exact address in Sand Coulee, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sand Coulee averages can't show:
We read public map data around Sand Coulee — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sand Coulee average
How we know this about Sand Coulee
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 Sand Coulee’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 Sand Coulee
When does frost risk typically end in Sand Coulee?
The last hard freeze (28°F) in Sand Coulee typically lands around Apr 29, 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 20.
When is the first frost in Sand Coulee?
The first hard freeze (28°F) in Sand Coulee typically arrives around Oct 8, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 24, so the watching starts about Sep 8 — about 162 days after the spring freeze cleared.
How long is the growing season in Sand Coulee?
Measured between 28°F hard freezes, Sand Coulee sees about 162 frost-free days — roughly Apr 29 through Oct 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 20 to Sep 24, about 127 days.
Is the soil safe to grow vegetables in Sand Coulee?
The federal record around Sand Coulee is a meaningful one — 339 documented sites, mostly Underground Storage Tanks entries (203), the nearest Underground Storage Tanks record about 0.4 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Sand Coulee?
From about Sep 8 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 8 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 8. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sand Coulee's scale — its 4b band and its 162-day season. Your yard writes its own version of Sand Coulee'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 Sand Coulee’s own scale
6 of the readings below were taken at Sand Coulee's own scale — its own ~162-day season between 28°F freezes, the 1,720 acres it covers and 339 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sand Coulee's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Sand Coulee's own 28°F hard-freeze dates, about Apr 29 and Oct 8 and the ~162-day span between themNOAA 1991–2020 Climate Normals
- 339 documented contamination sites on the federal record near Sand Coulee, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Sand Coulee's boundary and the 1,720 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~162-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sand Coulee's own centroid, the Northwestern Glaciated PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Sand Coulee's 1,720 acres read through its county's SSURGO summaryfrom Cascade County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Cascade 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 Cascade County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sand Coulee's 1,720 acreswhy one lot differs from the next →
- Which side of Sand Coulee you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,720 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Sand Coulee-wide figureread your own land →