Richey, Montana, sits in USDA hardiness zone 4a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Reliable performers under these conditions include cabbage, cranberry, turkish rocket, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Richey, 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 Richey 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 Richey — soil, climate, flood, and parcel records. How we handle your address.
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Richey — the short answer
Richey, Montana: USDA zone 4a, about 151 days between hard freezes, across 165 acres of town.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~151
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 165 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 4a is Richey's average, not your lot's — a low corner or a tree line moves it. Against Richey's 151-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Richey
Each reading below is measured for Richey itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRichey runs about 151 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
MeasuredRichey sits in USDA hardiness zone 4a.
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 Richey is in
Richey sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. That is read at Richey's own centroid rather than borrowed from Dawson County.
What Grows in Richey
Every plant below cleared Richey's own zone 4a and its 151-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Richey?
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 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 5 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 3 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Richey
Closest first, within ~10 miles of Richey. Listing isn't leaking, and distance isn't exposure.
- IRA A ZUROFFUnderground Storage Tanks · 400 ft
- GEORGE STROBELUnderground Storage Tanks · 400 ft
- SWITZER BROTHERS RANCHUnderground Storage Tanks · 400 ft
- DAWSON COUNTY SHOP RICHEYUnderground Storage Tanks · 400 ft
- FARMERS ELEVATOR/RICHEYUnderground Storage Tanks · 600 ft
- PEAVEY CO RICHEYUnderground Storage Tanks · 1500 ft
- RICHEYBrownfields · 1500 ft
- 22N52E30DCCD01Nitrate · 1.4 mi
- 22N52E25CBCA01Nitrate · 3.5 mi
- 22N51E10ADDA01Nitrate · 4.6 mi
- 21N51E14CBBB01Nitrate · 5.7 mi
- 23N52E28AA 01Nitrate · 6.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Richey'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 Richey.
Severity Distribution
within ~10 miles of Richey
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Richey, Nitrate runs higher than the national average — 26 sites within ~10 miles of Richey. That's not a problem with your land — it's information about it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Richey
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 Richey average
Your land is one point inside Richey
Everything above resolves to Richey as a whole — one PHZM band and one 28°F frost record, read across 165 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 Richey Average
Richey Average
- ●USDA Zones 4a, averaged across Richey
- ●One soil character for all of Richey
- ●Frost dates read at Richey's scale: May 5 to Oct 3
YOUR Parcel
- ✓Your exact zone, not Richey's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Richey
Pull a site-specific report for your exact address in Richey, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Richey averages can't show:
We read public map data around Richey — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Richey average
How we know this about Richey
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 Richey’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 Richey
When does frost risk typically end in Richey?
The last hard freeze (28°F) in Richey typically lands around May 5, 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 26.
When is the first frost in Richey?
The first hard freeze (28°F) in Richey typically arrives around Oct 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 19, so the watching starts about Sep 3 — about 151 days after the spring freeze cleared.
How long is the growing season in Richey?
Measured between 28°F hard freezes, Richey sees about 151 frost-free days — roughly May 5 through Oct 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 26 to Sep 19, about 116 days.
Is the soil safe to grow vegetables in Richey?
The federal record around Richey is light — 34 documented sites across the 9 federal source types we checked, mostly Nitrate entries (26), the nearest Underground Storage Tanks record under a tenth of a mile 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 I protect my plants from frost in Richey?
From about Sep 3 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 3 (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 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Richey's scale — its 4a band and its 151-day season. Your yard writes its own version of Richey'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 Richey’s own scale
6 of the readings below were taken at Richey's own scale — its own ~151-day season between 28°F freezes, the 165 acres it covers and 34 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Richey's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Richey's own 28°F hard-freeze dates, about May 5 and Oct 3 and the ~151-day span between themNOAA 1991–2020 Climate Normals
- 34 documented contamination sites on the federal record near Richey, the closest Underground Storage Tanks record under a tenth of a mile out from the town centreFederal environmental registers
- Richey's boundary and the 165 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~151-day seasonGrowable Ground crop-matching engine
- The ecoregion at Richey's own centroid, the Northwestern Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Richey's 165 acres read through its county's SSURGO summaryfrom Dawson County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Dawson 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 Dawson County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Richey's 165 acreswhy one lot differs from the next →
- Which side of Richey you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 165 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record under a tenth of a mile 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 Richey-wide figureread your own land →
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