Hanna, Wyoming, sits in USDA hardiness zone 4b — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Reliable performers under these conditions include cabbage, cranberry, cilantro, and collard greens; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Hanna, 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 Hanna 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 Hanna — soil, climate, flood, and parcel records. How we handle your address.
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Hanna — the short answer
Hanna, Wyoming: USDA zone 4b, about 138 days between hard freezes, across 1K acres of town.
- USDA zone
- 4b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 12
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~138
- 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 Hanna's average, not your lot's — a low corner or a tree line moves it. Against Hanna's 138-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Hanna
Each reading below is measured for Hanna itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHanna runs about 138 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
MeasuredHanna 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 Hanna is in
Hanna sits in the Wyoming Basin — EPA Level III, inside the wider North American Deserts. That is read at Hanna's own centroid rather than borrowed from Carbon County.
What Grows in Hanna
Every plant below cleared Hanna's own zone 4b and its 138-day season. Each card opens that plant's Wyoming profile. How we score.
Is it too late to plant in Hanna?
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Cool-season crops can go in from around Apr 14; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 12 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 27 — long-season crops need about 90 days of runway, quick greens only 30. In a season this compact, fast finishers and cold-hardy greens do the late work, and garlic tucked in before the freeze repays you next summer.
What's on the federal record near Hanna
Closest first, within ~10 miles of Hanna. Listing isn't leaking, and distance isn't exposure.
- HANNA BASIN GROUP (TRONOX)Superfund · 300 ft
- Hanna Relay StationUnderground Storage Tanks · 300 ft
- Seminoe I MineUnderground Storage Tanks · 300 ft
- Hanna AirportUnderground Storage Tanks · 650 ft
- K and S AutomotiveUnderground Storage Tanks · 700 ft
- Hanna-Elk Mountain High SchoolUnderground Storage Tanks · 1400 ft
- Jade Drive-InUnderground Storage Tanks · 2200 ft
- Town of HannaUnderground Storage Tanks · 2200 ft
- Carbon County Road and BridgeUnderground Storage Tanks · 2300 ft
- Kum and Go #962Underground Storage Tanks · 2500 ft
- Webster's ServiceUnderground Storage Tanks · 0.5 mi
- Hanna Card LockUnderground Storage Tanks · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Hanna'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 Hanna.
Total Sites
52
within ~10 miles of Hanna
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Hanna
Severity Distribution
within ~10 miles of Hanna
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Hanna, Nitrate runs higher than the national average — 34 sites within ~10 miles of Hanna. That's not a problem with your land — it's information about 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 Hanna
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 Hanna average
Your land is one point inside Hanna
Everything above resolves to Hanna 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 Hanna Average
Hanna Average
- ●USDA Zones 4b, averaged across Hanna
- ●One soil character for all of Hanna
- ●Frost dates read at Hanna's scale: May 12 to Sep 27
YOUR Parcel
- ✓Your exact zone, not Hanna's 4b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Hanna
Pull a site-specific report for your exact address in Hanna, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Hanna averages can't show:
We read public map data around Hanna — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Hanna average
How we know this about Hanna
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 Hanna’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 Hanna
When does frost risk typically end in Hanna?
The last hard freeze (28°F) in Hanna typically lands around May 12, 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 2.
When is the first frost in Hanna?
The first hard freeze (28°F) in Hanna typically arrives around Sep 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 13, so the watching starts about Aug 28 — about 138 days after the spring freeze cleared.
How long is the growing season in Hanna?
Measured between 28°F hard freezes, Hanna sees about 138 frost-free days — roughly May 12 through Sep 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 2 to Sep 13, about 103 days.
Is the soil safe to grow vegetables in Hanna?
The federal record around Hanna is a meaningful one — 52 documented sites, mostly Nitrate entries (34), the nearest Superfund record under a tenth of a mile 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 Hanna?
With about 138 frost-free days between hard freezes, Hanna 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 166 to 194 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 12 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Hanna's scale — its 4b band and its 138-day season. Your yard writes its own version of Hanna'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 Hanna’s own scale
6 of the readings below were taken at Hanna's own scale — its own ~138-day season between 28°F freezes, the 1,309 acres it covers and 52 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Hanna's own USDA hardiness band, zones 4bUSDA PHZM 2023
- Hanna's own 28°F hard-freeze dates, about May 12 and Sep 27 and the ~138-day span between themNOAA 1991–2020 Climate Normals
- 52 documented contamination sites on the federal record near Hanna, the closest Superfund record under a tenth of a mile out from the town centreFederal environmental registers
- Hanna's boundary and the 1,309 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4b and a ~138-day seasonGrowable Ground crop-matching engine
- The ecoregion at Hanna's own centroid, the Wyoming BasinUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Hanna's 1,309 acres read through its county's SSURGO summaryfrom Carbon County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Carbon 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 Carbon County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Hanna's 1,309 acreswhy one lot differs from the next →
- Which side of Hanna you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,309 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Superfund 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 Hanna-wide figureread your own land →
More in Wyoming
Wider growing context
What grows across WyomingHanna sits outside our named growing regions, so Wyoming as a whole is its closest context here.
Nearby growing guides