Owl Creek, Wyoming, sits in USDA hardiness zone 5a — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Expect cabbage, cranberry, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Owl Creek, 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 Owl Creek 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 Owl Creek — soil, climate, flood, and parcel records. How we handle your address.
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Owl Creek — the short answer
Owl Creek, Wyoming: USDA zone 5a, about 151 days between hard freezes, across 4K acres of town.
- USDA zone
- 5a
- 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 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~151
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town 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 5a is Owl Creek's average, not your lot's — a low corner or a tree line moves it. Against Owl Creek's 151-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Owl Creek
Each reading below is measured for Owl Creek itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredOwl Creek 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
MeasuredOwl Creek 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 Owl Creek is in
Owl Creek sits in the Wyoming Basin — EPA Level III, inside the wider North American Deserts. That is read at Owl Creek's own centroid rather than borrowed from Hot Springs County.
What Grows in Owl Creek
Every plant below cleared Owl Creek's own zone 5a and its 151-day season. Each card opens that plant's Wyoming profile. How we score.
Is it too late to plant in Owl Creek?
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 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 5 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Owl Creek
Closest first, within ~10 miles of Owl Creek. Listing isn't leaking, and distance isn't exposure.
- 9N-02E-25cad01Nitrate · 3.9 mi
- 9N-03E-33adb02Nitrate · 5.1 mi
- ROCKY MOUNTAIN PIPELINE SYSTEMBrownfields · 5.5 mi
- H D RanchUnderground Storage Tanks · 5.5 mi
- 43-097-05bcb01Nitrate · 6.2 mi
- Graham Resources, Inc.Underground Storage Tanks · 6.5 mi
- Arco Oil and Gas CompanyUnderground Storage Tanks · 6.5 mi
- 9N-02E-33cdc01Nitrate · 6.5 mi
- 9N-02E-32cbb01Nitrate · 7.0 mi
- 43-097-11ccc02Nitrate · 7.2 mi
- 43-098-07bcd01Nitrate · 7.3 mi
- 43-097-14bac01Nitrate · 7.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Owl Creek'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 Owl Creek.
Sources Checked
within ~10 miles of Owl Creek
Severity Distribution
within ~10 miles of Owl Creek
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Owl Creek, Nitrate runs higher than the national average — 26 sites within ~10 miles of Owl Creek. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Owl Creek
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 Owl Creek average
Your land is one point inside Owl Creek
Everything above resolves to Owl Creek 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 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 Owl Creek Average
Owl Creek Average
- ●USDA Zones 5a, averaged across Owl Creek
- ●One soil character for all of Owl Creek
- ●Frost dates read at Owl Creek's scale: May 7 to Oct 5
YOUR Parcel
- ✓Your exact zone, not Owl Creek's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Owl Creek
Pull a site-specific report for your exact address in Owl Creek, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Owl Creek averages can't show:
We read public map data around Owl Creek — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Owl Creek average
How we know this about Owl Creek
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 Owl Creek’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 Owl Creek
When does frost risk typically end in Owl Creek?
The last hard freeze (28°F) in Owl Creek 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 Owl Creek?
The first hard freeze (28°F) in Owl Creek typically arrives around Oct 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 21, so the watching starts about Sep 5 — about 151 days after the spring freeze cleared.
How long is the growing season in Owl Creek?
Measured between 28°F hard freezes, Owl Creek sees about 151 frost-free days — roughly May 7 through Oct 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 28 to Sep 21, about 116 days.
Is the soil safe to grow vegetables in Owl Creek?
The federal record around Owl Creek is light — 32 documented sites across the 9 federal source types we checked, mostly Nitrate entries (26), the nearest Nitrate record about 3.9 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 Owl Creek?
From about Sep 5 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 5 (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 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Owl Creek's scale — its 5a band and its 151-day season. Your yard writes its own version of Owl Creek'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 Owl Creek’s own scale
6 of the readings below were taken at Owl Creek's own scale — its own ~151-day season between 28°F freezes, the 4,180 acres it covers and 32 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Owl Creek's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Owl Creek's own 28°F hard-freeze dates, about May 7 and Oct 5 and the ~151-day span between themNOAA 1991–2020 Climate Normals
- 32 documented contamination sites on the federal record near Owl Creek, the closest Nitrate record about 3.9 miles out from the town centreFederal environmental registers
- Owl Creek's boundary and the 4,180 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~151-day seasonGrowable Ground crop-matching engine
- The ecoregion at Owl Creek's own centroid, the Wyoming BasinUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Owl Creek's 4,180 acres read through its county's SSURGO summaryfrom Hot Springs County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Hot Springs 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 Hot Springs County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Owl Creek's 4,180 acreswhy one lot differs from the next →
- Which side of Owl Creek you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 4,180 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 3.9 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 Owl Creek-wide figureread your own land →
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