North Rock Springs, Wyoming, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Crops well matched to these conditions include cabbage, blackberry, california poppy, and collard greens — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in North Rock Springs, 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 North Rock Springs 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 North Rock Springs — soil, climate, flood, and parcel records. How we handle your address.
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North Rock Springs — the short answer
North Rock Springs, Wyoming: USDA zone 6a, about 145 days between hard freezes, across 9K acres of town.
- USDA zone
- 6a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 12
- 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
- ~145
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 9K 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 6a is North Rock Springs's average, not your lot's — a low corner or a tree line moves it. Against North Rock Springs's 145-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in North Rock Springs
Each reading below is measured for North Rock Springs itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredNorth Rock Springs runs about 145 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
MeasuredNorth Rock Springs sits in USDA hardiness zone 6a.
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 North Rock Springs is in
North Rock Springs sits in the Wyoming Basin — EPA Level III, inside the wider North American Deserts. That is read at North Rock Springs's own centroid rather than borrowed from Sweetwater County.
What Grows in North Rock Springs
Every plant below cleared North Rock Springs's own zone 6a and its 145-day season. Each card opens that plant's Wyoming profile. How we score.
Is it too late to plant in North Rock Springs?
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 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 Oct 4 — long-season crops need about 90 days of runway, quick greens only 30. Even here the calendar’s edges hold value: thirty-day greens late in the window, then garlic and a rested bed for spring.
What's on the federal record near North Rock Springs
Closest first, within ~10 miles of North Rock Springs. Listing isn't leaking, and distance isn't exposure.
- 19-105-08bbd01Nitrate · 1.7 mi
- Searle Brothers Construction, Inc.Underground Storage Tanks · 1.8 mi
- B and S Trucking, Inc.Underground Storage Tanks · 2.2 mi
- Eagle Oil and Development, Inc.Underground Storage Tanks · 2.3 mi
- AOP H AntelopeUnderground Storage Tanks · 2.3 mi
- FINELINE AUTO BODYBrownfields · 2.4 mi
- C&G TRUCKING (FORMER HEMPHILL)Brownfields · 2.5 mi
- HB & R INCBrownfields · 2.5 mi
- American Industrial Laundry, Inc.Underground Storage Tanks · 2.5 mi
- RPM Trucking and Hotshot, Inc.Underground Storage Tanks · 2.5 mi
- Kellys (Hitching Post Gas and Grocery)Underground Storage Tanks · 2.6 mi
- Allphin PropertiesUnderground Storage Tanks · 2.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from North Rock Springs'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 North Rock Springs.
Total Sites
341
within ~10 miles of North Rock Springs
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of North Rock Springs
Severity Distribution
within ~10 miles of North Rock Springs
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •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.
Check your specific parcel in North Rock Springs
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 North Rock Springs average
Your land is one point inside North Rock Springs
Everything above resolves to North Rock Springs as a whole — one PHZM band and one 28°F frost record, read across 9K 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 North Rock Springs Average
North Rock Springs Average
- ●USDA Zones 6a, averaged across North Rock Springs
- ●One soil character for all of North Rock Springs
- ●Frost dates read at North Rock Springs's scale: May 12 to Oct 4
YOUR Parcel
- ✓Your exact zone, not North Rock Springs's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in North Rock Springs
Pull a site-specific report for your exact address in North Rock Springs, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that North Rock Springs averages can't show:
We read public map data around North Rock Springs — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the North Rock Springs average
How we know this about North Rock Springs
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 North Rock Springs’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 North Rock Springs
When does frost risk typically end in North Rock Springs?
The last hard freeze (28°F) in North Rock Springs 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 North Rock Springs?
The first hard freeze (28°F) in North Rock Springs 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 145 days after the spring freeze cleared.
How long is the growing season in North Rock Springs?
Measured between 28°F hard freezes, North Rock Springs sees about 145 frost-free days — roughly May 12 through Oct 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 2 to Sep 20, about 110 days.
Is the soil safe to grow vegetables in North Rock Springs?
The federal record around North Rock Springs is a meaningful one — 341 documented sites, mostly Underground Storage Tanks entries (191), the nearest Nitrate record about 1.7 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 North Rock Springs?
With about 145 frost-free days between hard freezes, North Rock Springs 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 173 to 201 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 North Rock Springs's scale — its 6a band and its 145-day season. Your yard writes its own version of North Rock Springs'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 North Rock Springs’s own scale
6 of the readings below were taken at North Rock Springs's own scale — its own ~145-day season between 28°F freezes, the 9,444 acres it covers and 341 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- North Rock Springs's own USDA hardiness band, zones 6aUSDA PHZM 2023
- North Rock Springs's own 28°F hard-freeze dates, about May 12 and Oct 4 and the ~145-day span between themNOAA 1991–2020 Climate Normals
- 341 documented contamination sites on the federal record near North Rock Springs, the closest Nitrate record about 1.7 miles out from the town centreFederal environmental registers
- North Rock Springs's boundary and the 9,444 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~145-day seasonGrowable Ground crop-matching engine
- The ecoregion at North Rock Springs's own centroid, the Wyoming BasinUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so North Rock Springs's 9,444 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 North Rock Springs's 9,444 acreswhy one lot differs from the next →
- Which side of North Rock Springs you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 9,444 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 1.7 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 North Rock Springs-wide figureread your own land →
More in Wyoming
Wider growing context
What grows across WyomingNorth Rock Springs sits outside our named growing regions, so Wyoming as a whole is its closest context here.
Nearby growing guides