Superior, 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.
Growers here do well with cabbage, cranberry, lavender, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Superior, 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 Superior 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 Superior — soil, climate, flood, and parcel records. How we handle your address.
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Superior — the short answer
Superior, Wyoming: USDA zone 5a, about 146 days between hard freezes, across 716 acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~146
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 716 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 Superior's average, not your lot's — a low corner or a tree line moves it. Against Superior's 146-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Superior
Each reading below is measured for Superior itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSuperior runs about 146 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
MeasuredSuperior 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 Superior is in
Superior sits in the Wyoming Basin — EPA Level III, inside the wider North American Deserts. That is read at Superior's own centroid rather than borrowed from Sweetwater County.
What Grows in Superior
Every plant below cleared Superior's own zone 5a and its 146-day season. Each card opens that plant's Wyoming profile. How we score.
Is it too late to plant in Superior?
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 13; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 11 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 4 — 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 Superior
Closest first, within ~10 miles of Superior. Listing isn't leaking, and distance isn't exposure.
- QUESTAR PIPELINE COMPANY - CKNBrownfields · 6.1 mi
- SLT EXPRESS WAY INC DBA SECURED LAND TRANSPORTBrownfields · 6.1 mi
- POINT OF ROCKS COMPRESSOR STATIONBrownfields · 6.3 mi
- 21-101-21ada01Nitrate · 6.5 mi
- 19-103-01 01Nitrate · 7.3 mi
- JIM BRIDGER POWER PLANTBrownfields · 8.8 mi
- JIM BRIDGER PLANTToxics Release Inventory · 9.1 mi
Measured from Superior'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 Superior.
Total Sites
9
within ~10 miles of Superior
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Severity Distribution
within ~10 miles of Superior
Highest-Severity Sites
Know Before You Grow
- •Near a brownfield, raised beds of imported soil give your food clean ground.
- •On a private well, test for nitrates: above 10 mg/L the water needs treatment before irrigating.
- •TRI facilities report what they release. Check the wind — downwind beds catch more of it.
Check your specific parcel in Superior
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 Superior average
Your land is one point inside Superior
Everything above resolves to Superior as a whole — one PHZM band and one 28°F frost record, read across 716 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 Superior Average
Superior Average
- ●USDA Zones 5a, averaged across Superior
- ●One soil character for all of Superior
- ●Frost dates read at Superior's scale: May 11 to Oct 4
YOUR Parcel
- ✓Your exact zone, not Superior's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Superior
Pull a site-specific report for your exact address in Superior, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Superior averages can't show:
We read public map data around Superior — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Superior average
How we know this about Superior
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 Superior’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 Superior
When does frost risk typically end in Superior?
The last hard freeze (28°F) in Superior typically lands around May 11, 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 1.
When is the first frost in Superior?
The first hard freeze (28°F) in Superior typically arrives around Oct 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 20, so the watching starts about Sep 4 — about 146 days after the spring freeze cleared.
How long is the growing season in Superior?
Measured between 28°F hard freezes, Superior sees about 146 frost-free days — roughly May 11 through Oct 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 1 to Sep 20, about 111 days.
Is the soil safe to grow vegetables in Superior?
The federal record around Superior is light — 9 documented sites across the 9 federal source types we checked, mostly Brownfields entries (4), the nearest Brownfields record about 6.1 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 gardeners stretch the season in Superior?
With about 146 frost-free days between hard freezes, Superior 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 174 to 202 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 11 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Superior's scale — its 5a band and its 146-day season. Your yard writes its own version of Superior'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 Superior’s own scale
6 of the readings below were taken at Superior's own scale — its own ~146-day season between 28°F freezes, the 716 acres it covers and 9 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Superior's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Superior's own 28°F hard-freeze dates, about May 11 and Oct 4 and the ~146-day span between themNOAA 1991–2020 Climate Normals
- 9 documented contamination sites on the federal record near Superior, the closest Brownfields record about 6.1 miles out from the town centreFederal environmental registers
- Superior's boundary and the 716 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~146-day seasonGrowable Ground crop-matching engine
- The ecoregion at Superior's own centroid, the Wyoming BasinUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Superior's 716 acres read through its county's SSURGO summaryfrom Sweetwater County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Sweetwater 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 Sweetwater County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Superior's 716 acreswhy one lot differs from the next →
- Which side of Superior you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 716 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 6.1 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 Superior-wide figureread your own land →
More in Wyoming
Wider growing context
What grows across WyomingSuperior sits outside our named growing regions, so Wyoming as a whole is its closest context here.
Nearby growing guides