Thayne, Wyoming, sits in USDA hardiness zone 5a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Among the crops suited to this profile: okra, cranberry, lavender, and pumpkin. The site-level story — soil, sun, drainage — decides the rest.
Even in Thayne, 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 Thayne 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 Thayne — soil, climate, flood, and parcel records. How we handle your address.
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Thayne — the short answer
Thayne, Wyoming: USDA zone 5a, about 119 days between hard freezes, across 1K acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 22
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~119
- 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 5a is Thayne's average, not your lot's — a low corner or a tree line moves it. Against Thayne's 119-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Thayne
Each reading below is measured for Thayne itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredThayne 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
MeasuredThayne 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 Thayne is in
Thayne sits in the Middle Rockies — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Thayne's own centroid, and it is not what its county reads: Lincoln County is mostly Wyoming Basin. The wider page above you is answering a different question about different ground.
What Grows in Thayne
Every plant below cleared Thayne's own zone 5a and its 119-day season. Each card opens that plant's Wyoming profile. How we score.
Is it too late to plant in Thayne?
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 24; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 22 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 18 — long-season crops need about 90 days of runway, quick greens only 30. When the window is tight, the fall moves are quick ones — baby greens, radishes, and garlic set for next season.
What's on the federal record near Thayne
Closest first, within ~10 miles of Thayne. Listing isn't leaking, and distance isn't exposure.
- Skinner Service and Auto BodyUnderground Storage Tanks · 1900 ft
- Maverik Country Store # 70Underground Storage Tanks · 1900 ft
- Maverik Country Store #276Underground Storage Tanks · 2000 ft
- UPS - THAYNEBrownfields · 2100 ft
- STAR VALLEY CHEESEToxics Release Inventory · 2200 ft
- Star Valley Quick StopUnderground Storage Tanks · 2400 ft
- Swiss Mountain MotelUnderground Storage Tanks · 2600 ft
- 34-119-14bbd01Nitrate · 1.3 mi
- 34-119-11cdc01Nitrate · 1.5 mi
- 34-119-11cac01Nitrate · 1.7 mi
- Lincoln County - Road and Bridge Afton ShopUnderground Storage Tanks · 1.8 mi
- Lincoln County - Road and Bridge Thayne ShopUnderground Storage Tanks · 1.8 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Thayne'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 Thayne.
Total Sites
70
within ~10 miles of Thayne
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Thayne
Severity Distribution
within ~10 miles of Thayne
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Thayne, Nitrate runs higher than the national average — 44 sites within ~10 miles of Thayne. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Thayne
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 Thayne average
Your land is one point inside Thayne
Everything above resolves to Thayne 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 Thayne Average
Thayne Average
- ●USDA Zones 5a, averaged across Thayne
- ●One soil character for all of Thayne
- ●Frost dates read at Thayne's scale: May 22 to Sep 18
YOUR Parcel
- ✓Your exact zone, not Thayne's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Thayne
Pull a site-specific report for your exact address in Thayne, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Thayne averages can't show:
We read public map data around Thayne — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Thayne average
How we know this about Thayne
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 Thayne’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 Thayne
When does frost risk typically end in Thayne?
The last hard freeze (28°F) in Thayne typically lands around May 22, 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 12.
When is the first frost in Thayne?
The first hard freeze (28°F) in Thayne typically arrives around Sep 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 4, so the watching starts about Aug 19 — about 119 days after the spring freeze cleared.
How long is the growing season in Thayne?
Measured between 28°F hard freezes, Thayne sees about 119 frost-free days — roughly May 22 through Sep 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 12 to Sep 4, about 84 days.
Is the soil safe to grow vegetables in Thayne?
The federal record around Thayne is a meaningful one — 70 documented sites, mostly Nitrate entries (44), the nearest Underground Storage Tanks record about 0.4 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do gardeners stretch the season in Thayne?
With about 119 frost-free days between hard freezes, Thayne 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 22 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Thayne's scale — its 5a band and its 119-day season. Your yard writes its own version of Thayne'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 Thayne’s own scale
6 of the readings below were taken at Thayne's own scale — its own ~119-day season between 28°F freezes, the 1,094 acres it covers and 70 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Thayne's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Thayne's own 28°F hard-freeze dates, about May 22 and Sep 18 and the ~119-day span between themNOAA 1991–2020 Climate Normals
- 70 documented contamination sites on the federal record near Thayne, the closest Underground Storage Tanks record about 0.4 miles out from the town centreFederal environmental registers
- Thayne's boundary and the 1,094 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~119-day seasonGrowable Ground crop-matching engine
- Thayne sits in the Middle Rockies — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Thayne's 1,094 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 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 Lincoln County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Thayne's 1,094 acreswhy one lot differs from the next →
- Which side of Thayne you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,094 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.4 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 Thayne-wide figureread your own land →
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