Osage, Wyoming, sits in USDA hardiness zone 4b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 Osage, 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 Osage 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 Osage — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Osage — the short answer
Osage, Wyoming: USDA zone 4b, about 153 days between hard freezes, across 1K acres of town.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~153
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 Osage's average, not your lot's — a low corner or a tree line moves it. Against Osage's 153-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Osage
Each reading below is measured for Osage itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOsage runs about 153 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
MeasuredOsage 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 Osage is in
Osage sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. That is read at Osage's own centroid rather than borrowed from Weston County.
What Grows in Osage
Every plant below cleared Osage's own zone 4b and its 153-day season. Each card opens that plant's Wyoming profile. How we score.
Is it too late to plant in Osage?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 7 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 7 — 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 Osage
Closest first, within ~10 miles of Osage. Listing isn't leaking, and distance isn't exposure.
- Holwell Drilling Company, Inc.Underground Storage Tanks · 0.5 mi
- Mercantile ExpressUnderground Storage Tanks · 0.6 mi
- Cowgirl LeaseUnderground Storage Tanks · 0.7 mi
- Petro Lewis - Osage OfficeUnderground Storage Tanks · 0.8 mi
- Harper ServiceUnderground Storage Tanks · 0.8 mi
- BLACK HILLS POWER AND LIGHT COMPANY - OSAGE POWER PLANTToxics Release Inventory · 1.5 mi
- 46-063-15aba01Nitrate · 1.8 mi
- 46-063-17cbc02Nitrate · 1.9 mi
- 47-063-31cda01Nitrate · 2.2 mi
- 46-064-13cc 02Nitrate · 3.4 mi
- Baroid Drilling Fluids, Inc.Underground Storage Tanks · 5.2 mi
- 47-064-31bb 01Nitrate · 8.4 mi
3 more sites are on the record inside the same radius. See them on the map
Measured from Osage'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 Osage.
Total Sites
22
within ~10 miles of Osage
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Osage
Severity Distribution
within ~10 miles of Osage
Highest-Severity Sites
Know Before You Grow
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •TRI facilities report what they release. Check the wind — downwind beds catch more of it.
Check your specific parcel in Osage
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 Osage average
Your land is one point inside Osage
Everything above resolves to Osage as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Osage Average
Osage Average
- ●USDA Zones 4b, averaged across Osage
- ●One soil character for all of Osage
- ●Frost dates read at Osage's scale: May 7 to Oct 7
YOUR Parcel
- ✓Your exact zone, not Osage's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Osage
Pull a site-specific report for your exact address in Osage, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Osage averages can't show:
We read public map data around Osage — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Osage average
How we know this about Osage
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 Osage’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 Osage
When does frost risk typically end in Osage?
The last hard freeze (28°F) in Osage typically lands around May 7, 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 28.
When is the first frost in Osage?
The first hard freeze (28°F) in Osage typically arrives around Oct 7, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 23, so the watching starts about Sep 7 — about 153 days after the spring freeze cleared.
How long is the growing season in Osage?
Measured between 28°F hard freezes, Osage sees about 153 frost-free days — roughly May 7 through Oct 7, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 28 to Sep 23, about 118 days.
Is the soil safe to grow vegetables in Osage?
The federal record around Osage is light — 22 documented sites across the 9 federal source types we checked, mostly Nitrate entries (14), the nearest Underground Storage Tanks record about 0.5 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 Osage?
From about Sep 7 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 7 (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 7. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Osage's scale — its 4b band and its 153-day season. Your yard writes its own version of Osage'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 Osage’s own scale
6 of the readings below were taken at Osage's own scale — its own ~153-day season between 28°F freezes, the 1,232 acres it covers and 22 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Osage's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Osage's own 28°F hard-freeze dates, about May 7 and Oct 7 and the ~153-day span between themNOAA 1991–2020 Climate Normals
- 22 documented contamination sites on the federal record near Osage, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Osage's boundary and the 1,232 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~153-day seasonGrowable Ground crop-matching engine
- The ecoregion at Osage's own centroid, the Northwestern Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Osage's 1,232 acres read through its county's SSURGO summaryfrom Weston County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Weston County
- The growing challenges every Wyoming grower plans around — written at state scale, so they stay on the state guidefrom Wyoming
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Weston County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Osage's 1,232 acreswhy one lot differs from the next →
- Which side of Osage you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,232 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.5 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 Osage-wide figureread your own land →
More in Wyoming
Wider growing context
What grows across WyomingOsage sits outside our named growing regions, so Wyoming as a whole is its closest context here.
Nearby growing guides