Indian Springs, Montana, sits in USDA hardiness zone 5a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, cranberry, lavender, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Indian Springs, 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 Indian Springs 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 Indian Springs — soil, climate, flood, and parcel records. How we handle your address.
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Indian Springs — the short answer
Indian Springs, Montana: USDA zone 5a, about 160 days between hard freezes, across 3K acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 1
- 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
- ~160
- 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 5a is Indian Springs's average, not your lot's — a low corner or a tree line moves it. Against Indian Springs's 160-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Indian Springs
Each reading below is measured for Indian Springs itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredIndian Springs runs about 160 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
MeasuredIndian Springs sits in USDA hardiness zone 5a.
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 Indian Springs is in
Indian Springs sits in the Northern Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Indian Springs's own centroid rather than borrowed from Lincoln County.
What Grows in Indian Springs
Every plant below cleared Indian Springs's own zone 5a and its 160-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Indian Springs?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 1 (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 Indian Springs
Closest first, within ~10 miles of Indian Springs. Listing isn't leaking, and distance isn't exposure.
- GIBBONS GARAGEBrownfields · 1.3 mi
- LINCOLN COUNTY SHOP EUREKAUnderground Storage Tanks · 1.9 mi
- LINCOLN COUNTY AIRPORTUnderground Storage Tanks · 1.9 mi
- Twin Peaks ProspectMining · 2.4 mi
- Hansen ProspectMining · 2.5 mi
- OWENS & HURST LUMBER CO INCUnderground Storage Tanks · 2.7 mi
- US CBP ROOSVILLE PORT OF ENTRY #MT0008Toxics Release Inventory · 2.8 mi
- DUKES BORDER MARTUnderground Storage Tanks · 2.9 mi
- KSANKA MOTEL & MINI MARTUnderground Storage Tanks · 3.4 mi
- IndependenceMining · 3.6 mi
- MDOT EUREKA SITEUnderground Storage Tanks · 3.7 mi
- 36N27W04DC 02Nitrate · 4.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Indian Springs'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 Indian Springs.
Total Sites
44
within ~10 miles of Indian Springs
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Indian Springs
Severity Distribution
within ~10 miles of Indian Springs
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Indian Springs, two things run higher than the national average within ~10 miles of Indian Springs — Mining (10 sites) and Nitrate (12 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Indian Springs
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 Indian Springs average
Your land is one point inside Indian Springs
Everything above resolves to Indian Springs 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 Indian Springs Average
Indian Springs Average
- ●USDA Zones 5a, averaged across Indian Springs
- ●One soil character for all of Indian Springs
- ●Frost dates read at Indian Springs's scale: May 1 to Oct 8
YOUR Parcel
- ✓Your exact zone, not Indian Springs's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Indian Springs
Pull a site-specific report for your exact address in Indian Springs, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Indian Springs averages can't show:
We read public map data around Indian Springs — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Indian Springs average
How we know this about Indian Springs
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 Indian Springs’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 Indian Springs
When does frost risk typically end in Indian Springs?
The last hard freeze (28°F) in Indian Springs typically lands around May 1, 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 22.
When is the first frost in Indian Springs?
The first hard freeze (28°F) in Indian Springs 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 160 days after the spring freeze cleared.
How long is the growing season in Indian Springs?
Measured between 28°F hard freezes, Indian Springs sees about 160 frost-free days — roughly May 1 through Oct 8, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 22 to Sep 24, about 125 days.
Is the soil safe to grow vegetables in Indian Springs?
The federal record around Indian Springs is light — 44 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (18), the nearest Brownfields record about 1.3 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 I protect my plants from frost in Indian Springs?
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 Indian Springs's scale — its 5a band and its 160-day season. Your yard writes its own version of Indian Springs'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 Indian Springs’s own scale
6 of the readings below were taken at Indian Springs's own scale — its own ~160-day season between 28°F freezes, the 2,881 acres it covers and 44 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Indian Springs's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Indian Springs's own 28°F hard-freeze dates, about May 1 and Oct 8 and the ~160-day span between themNOAA 1991–2020 Climate Normals
- 44 documented contamination sites on the federal record near Indian Springs, the closest Brownfields record about 1.3 miles out from the town centreFederal environmental registers
- Indian Springs's boundary and the 2,881 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~160-day seasonGrowable Ground crop-matching engine
- The ecoregion at Indian Springs's own centroid, the Northern RockiesUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Indian Springs's 2,881 acres read through its county's SSURGO summaryfrom Lincoln County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Lincoln 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 Lincoln County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Indian Springs's 2,881 acreswhy one lot differs from the next →
- Which side of Indian Springs you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,881 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 1.3 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 Indian Springs-wide figureread your own land →
More in Montana
Wider growing context
What grows across MontanaIndian Springs sits outside our named growing regions, so Montana as a whole is its closest context here.
Nearby growing guides