Shelby, Montana, sits in USDA hardiness zone 4a — a zone band wide enough that plant choice, not possibility, is the interesting question.
These conditions suit cabbage, cranberry, turkish rocket, and collard greens — a starting list any specific site will trim or extend with its own soil, sun, and drainage.
Even in Shelby, 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 Shelby 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 Shelby — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Shelby — the short answer
Shelby, Montana: USDA zone 4a, about 151 days between hard freezes, across 4K acres of city.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 2
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~151
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 4K 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 Shelby's average, not your lot's — a low corner or a tree line moves it. Against Shelby's 151-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Shelby
Each reading below is measured for Shelby itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredShelby 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
MeasuredShelby 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 Shelby is in
Shelby sits in the Northwestern Glaciated Plains — EPA Level III, inside the wider Great Plains. That is read at Shelby's own centroid rather than borrowed from Toole County.
What Grows in Shelby
Every plant below cleared Shelby'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 Shelby?
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 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 2 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Shelby
Closest first, within ~10 miles of Shelby. Listing isn't leaking, and distance isn't exposure.
- LUNDA READY MIXUnderground Storage Tanks · 1400 ft
- R CLEANERSBrownfields · 1500 ft
- R E SVAREUnderground Storage Tanks · 1500 ft
- OLD TOOLE COUNTY HOSPITALUnderground Storage Tanks · 1500 ft
- SHELBY SCHOOL DIST 14 BUS BARNUnderground Storage Tanks · 1500 ft
- BRYANS AUTO REPAIRUnderground Storage Tanks · 1700 ft
- RAINBOW CONOCO SERVICE STATIONBrownfields · 1700 ft
- SHELBY MOTORS LLCBrownfields · 1700 ft
- RAINBOW FORD & MERCURY INCUnderground Storage Tanks · 1700 ft
- SHELBY HIGH SCHOOL 1178Brownfields · 1800 ft
- TELSTAD COMPRESSOR STATIONBrownfields · 1800 ft
- FULTON PRODUCING COUnderground Storage Tanks · 1900 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Shelby'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 Shelby.
Total Sites
88
within ~10 miles of Shelby
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Shelby
Severity Distribution
within ~10 miles of Shelby
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Shelby, Underground Storage Tanks runs higher than the national average — 58 sites within ~10 miles of Shelby. That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Shelby
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 Shelby average
Your land is one point inside Shelby
Everything above resolves to Shelby as a whole — one PHZM band and one 28°F frost record, read across 4K 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 city 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 Shelby Average
Shelby Average
- ●USDA Zones 4a, averaged across Shelby
- ●One soil character for all of Shelby
- ●Frost dates read at Shelby's scale: May 4 to Oct 2
YOUR Parcel
- ✓Your exact zone, not Shelby's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Shelby
Pull a site-specific report for your exact address in Shelby, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Shelby averages can't show:
We read public map data around Shelby — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Shelby average
How we know this about Shelby
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Shelby’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 city grain anywhere on this page — there is no city-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 Shelby
When does frost risk typically end in Shelby?
The last hard freeze (28°F) in Shelby typically lands around May 4, 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 25.
When is the first frost in Shelby?
The first hard freeze (28°F) in Shelby typically arrives around Oct 2, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 18, so the watching starts about Sep 2 — about 151 days after the spring freeze cleared.
How long is the growing season in Shelby?
Measured between 28°F hard freezes, Shelby sees about 151 frost-free days — roughly May 4 through Oct 2, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 25 to Sep 18, about 116 days.
Is the soil safe to grow vegetables in Shelby?
The federal record around Shelby shows 88 documented sites, mostly Underground Storage Tanks entries (58), the nearest Underground Storage Tanks record about 0.3 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Shelby?
From about Sep 2 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 2 (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 2. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Shelby's scale — its 4a band and its 151-day season. Your yard writes its own version of Shelby'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 Shelby’s own scale
6 of the readings below were taken at Shelby's own scale — its own ~151-day season between 28°F freezes, the 3,700 acres it covers and 88 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Shelby's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Shelby's own 28°F hard-freeze dates, about May 4 and Oct 2 and the ~151-day span between themNOAA 1991–2020 Climate Normals
- 88 documented contamination sites on the federal record near Shelby, the closest Underground Storage Tanks record about 0.3 miles out from the town centreFederal environmental registers
- Shelby's boundary and the 3,700 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 Shelby's own centroid, the Northwestern Glaciated PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Shelby's 3,700 acres read through its county's SSURGO summaryfrom Toole County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Toole 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 Toole County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Shelby's 3,700 acreswhy one lot differs from the next →
- Which side of Shelby you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,700 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.3 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 Shelby-wide figureread your own land →
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