Argenta, Montana, sits in USDA hardiness zone 5a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Crops well matched to these conditions include okra, cranberry, lavender, and pumpkin — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Argenta, 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 Argenta 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 Argenta — soil, climate, flood, and parcel records. How we handle your address.
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Argenta — the short answer
Argenta, Montana: USDA zone 5a, about 119 days between hard freezes, across 191 acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 24
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~119
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 191 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 Argenta's average, not your lot's — a low corner or a tree line moves it. Against Argenta's 119-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Argenta
Each reading below is measured for Argenta itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredArgenta runs about 119 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
MeasuredArgenta 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 Argenta is in
Argenta sits in the Middle Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Argenta's own centroid rather than borrowed from Beaverhead County.
What Grows in Argenta
Every plant below cleared Argenta's own zone 5a and its 119-day season. Each card opens that plant's Montana profile. How we score.
Is it too late to plant in Argenta?
Almost never — the real question is what to plant next. Cool-season crops can go in from around Apr 26; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 24 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 20 — 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 Argenta
Closest first, within ~10 miles of Argenta. Listing isn't leaking, and distance isn't exposure.
- Bella MineMining · 900 ft
- Ferdinand MineMining · 1400 ft
- Amaranth MineMining · 1900 ft
- Copper BellMining · 2400 ft
- Copper Bell MineMining · 2500 ft
- Jack Rabbit MineMining · 2500 ft
- Graybird GroupMining · 0.5 mi
- GraybirdMining · 0.6 mi
- Hand Mauldin GroupMining · 0.6 mi
- Argenta DistrictMining · 0.6 mi
- Iron Mtn MineMining · 0.6 mi
- Hand Mauldin MineMining · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Argenta'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 Argenta.
Sources Checked
within ~10 miles of Argenta
Severity Distribution
within ~10 miles of Argenta
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Argenta, Mining runs higher than the national average — 190 sites within ~10 miles of Argenta. 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.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Argenta
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 Argenta average
Your land is one point inside Argenta
Everything above resolves to Argenta as a whole — one PHZM band and one 28°F frost record, read across 191 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 Argenta Average
Argenta Average
- ●USDA Zones 5a, averaged across Argenta
- ●One soil character for all of Argenta
- ●Frost dates read at Argenta's scale: May 24 to Sep 20
YOUR Parcel
- ✓Your exact zone, not Argenta's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Argenta
Pull a site-specific report for your exact address in Argenta, Montana — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Argenta averages can't show:
We read public map data around Argenta — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Argenta average
How we know this about Argenta
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 Argenta’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 Argenta
When does frost risk typically end in Argenta?
The last hard freeze (28°F) in Argenta typically lands around May 24, 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 14.
When is the first frost in Argenta?
The first hard freeze (28°F) in Argenta typically arrives around Sep 20, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 6, so the watching starts about Aug 21 — about 119 days after the spring freeze cleared.
How long is the growing season in Argenta?
Measured between 28°F hard freezes, Argenta sees about 119 frost-free days — roughly May 24 through Sep 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 14 to Sep 6, about 84 days.
Is the soil safe to grow vegetables in Argenta?
The federal record around Argenta runs heavier than most — 196 documented sites, mostly Mining entries (190), the nearest Mining record about 0.2 miles 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 Argenta?
With about 119 frost-free days between hard freezes, Argenta 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 147 to 175 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 24 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Argenta's scale — its 5a band and its 119-day season. Your yard writes its own version of Argenta'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 Argenta’s own scale
6 of the readings below were taken at Argenta's own scale — its own ~119-day season between 28°F freezes, the 191 acres it covers and 196 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Argenta's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Argenta's own 28°F hard-freeze dates, about May 24 and Sep 20 and the ~119-day span between themNOAA 1991–2020 Climate Normals
- 196 documented contamination sites on the federal record near Argenta, the closest Mining record about 0.2 miles out from the town centreFederal environmental registers
- Argenta's boundary and the 191 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~119-day seasonGrowable Ground crop-matching engine
- The ecoregion at Argenta's own centroid, the Middle RockiesUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Argenta's 191 acres read through its county's SSURGO summaryfrom Beaverhead County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Beaverhead 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 Beaverhead County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Argenta's 191 acreswhy one lot differs from the next →
- Which side of Argenta you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 191 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Mining record about 0.2 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 Argenta-wide figureread your own land →
More in Montana
Wider growing context
What grows across MontanaArgenta sits outside our named growing regions, so Montana as a whole is its closest context here.
Nearby growing guides