Camp Three, Montana, sits in USDA hardiness zone 4b — a zone band wide enough that plant choice, not possibility, is the interesting question.
The conditions favor cabbage, cranberry, turkish rocket, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Camp Three, 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 Camp Three 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 Camp Three — soil, climate, flood, and parcel records. How we handle your address.
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Camp Three — the short answer
Camp Three, Montana: USDA zone 4b, about 159 days between hard freezes, across 3K acres of town.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 30
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~159
- 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 Camp Three's average, not your lot's — a low corner or a tree line moves it. Against Camp Three's 159-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Camp Three
Each reading below is measured for Camp Three itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCamp Three runs about 159 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
MeasuredCamp Three 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 Camp Three is in
Camp Three sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. That is read at Camp Three's own centroid rather than borrowed from Musselshell County.
What Grows in Camp Three
Every plant below cleared Camp Three's own zone 4b and its 159-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Camp Three?
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 2; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 30 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 6 — 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 Camp Three
Closest first, within ~10 miles of Camp Three. Listing isn't leaking, and distance isn't exposure.
- GEBHARDT POST PLANT & SAWMILLBrownfields · 1.0 mi
- COUNTY SHOP ROUNDUPUnderground Storage Tanks · 1.1 mi
- ROUNDUP HIGH SCHOOLBrownfields · 1.3 mi
- LAWRENCE SEALEY 7TH ST EUnderground Storage Tanks · 1.3 mi
- C BREWER INCUnderground Storage Tanks · 1.3 mi
- KOMBOLS KORNER CLOSEDUnderground Storage Tanks · 1.3 mi
- EXPRESS CENTER CONVENIENCE STOREUnderground Storage Tanks · 1.3 mi
- ROUNDUP MEMORIAL HOSPITALUnderground Storage Tanks · 1.3 mi
- BOBS ALT & STARTERUnderground Storage Tanks · 1.4 mi
- BLM-ROUNDUP LANDFILLSuperfund · 1.5 mi
- ROUNDUP BEACON MICROWAVE SITEUnderground Storage Tanks · 1.5 mi
- MDOT ROUNDUP SITEUnderground Storage Tanks · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Camp Three'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 Camp Three.
Total Sites
72
within ~10 miles of Camp Three
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Camp Three
Severity Distribution
within ~10 miles of Camp Three
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Camp Three, Nitrate runs higher than the national average — 30 sites within ~10 miles of Camp Three. 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 Camp Three
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 Camp Three average
Your land is one point inside Camp Three
Everything above resolves to Camp Three 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 Camp Three Average
Camp Three Average
- ●USDA Zones 4b, averaged across Camp Three
- ●One soil character for all of Camp Three
- ●Frost dates read at Camp Three's scale: Apr 30 to Oct 6
YOUR Parcel
- ✓Your exact zone, not Camp Three's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Camp Three
Pull a site-specific report for your exact address in Camp Three, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Camp Three averages can't show:
We read public map data around Camp Three — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Camp Three average
How we know this about Camp Three
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 Camp Three’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 Camp Three
When does frost risk typically end in Camp Three?
The last hard freeze (28°F) in Camp Three typically lands around Apr 30, 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 21.
When is the first frost in Camp Three?
The first hard freeze (28°F) in Camp Three typically arrives around Oct 6, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 22, so the watching starts about Sep 6 — about 159 days after the spring freeze cleared.
How long is the growing season in Camp Three?
Measured between 28°F hard freezes, Camp Three sees about 159 frost-free days — roughly Apr 30 through Oct 6, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 21 to Sep 22, about 124 days.
Is the soil safe to grow vegetables in Camp Three?
The federal record around Camp Three is a meaningful one — 72 documented sites, mostly Underground Storage Tanks entries (37), the nearest Brownfields record about 1.0 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 Camp Three?
From about Sep 6 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 6 (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 6. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Camp Three's scale — its 4b band and its 159-day season. Your yard writes its own version of Camp Three'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 Camp Three’s own scale
6 of the readings below were taken at Camp Three's own scale — its own ~159-day season between 28°F freezes, the 2,851 acres it covers and 72 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Camp Three's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Camp Three's own 28°F hard-freeze dates, about Apr 30 and Oct 6 and the ~159-day span between themNOAA 1991–2020 Climate Normals
- 72 documented contamination sites on the federal record near Camp Three, the closest Brownfields record about 1.0 miles out from the town centreFederal environmental registers
- Camp Three's boundary and the 2,851 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~159-day seasonGrowable Ground crop-matching engine
- The ecoregion at Camp Three's own centroid, the Northwestern Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Camp Three's 2,851 acres read through its county's SSURGO summaryfrom Musselshell County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Musselshell 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 Musselshell County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Camp Three's 2,851 acreswhy one lot differs from the next →
- Which side of Camp Three you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,851 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 1.0 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 Camp Three-wide figureread your own land →
More in Montana
Wider growing context
What grows across MontanaCamp Three sits outside our named growing regions, so Montana as a whole is its closest context here.
Nearby growing guides