Rimini, Montana, sits in USDA hardiness zone 4a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Expect cabbage, cranberry, cilantro, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Rimini, 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 Rimini 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 Rimini — soil, climate, flood, and parcel records. How we handle your address.
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Rimini — the short answer
Rimini, Montana: USDA zone 4a, about 133 days between hard freezes, across 195 acres of town.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 15
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 25
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~133
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 195 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 Rimini's average, not your lot's — a low corner or a tree line moves it. Against Rimini's 133-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rimini
Each reading below is measured for Rimini itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRimini runs about 133 days between hard freezes — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredRimini 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 Rimini is in
Rimini sits in the Middle Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Rimini's own centroid rather than borrowed from Lewis and Clark County.
What Grows in Rimini
Every plant below cleared Rimini's own zone 4a and its 133-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Rimini?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Apr 17; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 15 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 25 — long-season crops need about 90 days of runway, quick greens only 30. Even here the calendar’s edges hold value: thirty-day greens late in the window, then garlic and a rested bed for spring.
What's on the federal record near Rimini
Closest first, within ~10 miles of Rimini. Listing isn't leaking, and distance isn't exposure.
- 09N05W33CBBC01Nitrate · 450 ft
- 09N05W33CBCA01Nitrate · 850 ft
- Valley ForgeMining · 850 ft
- Armstrong MineMining · 1500 ft
- Valley Forge MineMining · 2200 ft
- Little LillyMining · 2300 ft
- RiminiMining · 2300 ft
- Lee MountainMining · 2500 ft
- Rimini DistrictMining · 0.5 mi
- Red MountainMining · 0.8 mi
- UPPER TENMILE CREEK MINING AREASuperfund · 0.8 mi
- Alice LodeMining · 0.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rimini'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 Rimini.
Sources Checked
within ~10 miles of Rimini
Severity Distribution
within ~10 miles of Rimini
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rimini, Mining runs higher than the national average — 284 sites within ~10 miles of Rimini. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Rimini
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 Rimini average
Your land is one point inside Rimini
Everything above resolves to Rimini as a whole — one PHZM band and one 28°F frost record, read across 195 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 Rimini Average
Rimini Average
- ●USDA Zones 4a, averaged across Rimini
- ●One soil character for all of Rimini
- ●Frost dates read at Rimini's scale: May 15 to Sep 25
YOUR Parcel
- ✓Your exact zone, not Rimini's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rimini
Pull a site-specific report for your exact address in Rimini, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rimini averages can't show:
We read public map data around Rimini — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rimini average
How we know this about Rimini
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 Rimini’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 Rimini
When does frost risk typically end in Rimini?
The last hard freeze (28°F) in Rimini typically lands around May 15, 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 Jun 5.
When is the first frost in Rimini?
The first hard freeze (28°F) in Rimini typically arrives around Sep 25, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 11, so the watching starts about Aug 26 — about 133 days after the spring freeze cleared.
How long is the growing season in Rimini?
Measured between 28°F hard freezes, Rimini sees about 133 frost-free days — roughly May 15 through Sep 25, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 5 to Sep 11, about 98 days.
Is the soil safe to grow vegetables in Rimini?
The federal record around Rimini runs heavier than most — 342 documented sites, mostly Mining entries (284), the nearest Nitrate record under a tenth of a mile out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do gardeners stretch the season in Rimini?
With about 133 frost-free days between hard freezes, Rimini rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 161 to 189 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 15 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Rimini's scale — its 4a band and its 133-day season. Your yard writes its own version of Rimini'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 Rimini’s own scale
6 of the readings below were taken at Rimini's own scale — its own ~133-day season between 28°F freezes, the 195 acres it covers and 342 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rimini's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Rimini's own 28°F hard-freeze dates, about May 15 and Sep 25 and the ~133-day span between themNOAA 1991–2020 Climate Normals
- 342 documented contamination sites on the federal record near Rimini, the closest Nitrate record under a tenth of a mile out from the town centreFederal environmental registers
- Rimini's boundary and the 195 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~133-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rimini's own centroid, the Middle RockiesUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rimini's 195 acres read through its county's SSURGO summaryfrom Lewis and Clark County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Lewis and Clark 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 Lewis and Clark County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rimini's 195 acreswhy one lot differs from the next →
- Which side of Rimini you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 195 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate 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 Rimini-wide figureread your own land →
More in Montana
Wider growing context
What grows across MontanaRimini sits outside our named growing regions, so Montana as a whole is its closest context here.
Nearby growing guides