Laramie County, in Wyoming, sits in USDA hardiness zone 5b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Among the crops suited to this profile: cabbage, cranberry, lavender, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Laramie County lies within the High Plains — a regional growing area with its own character.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Laramie County holds more than one microclimate.
Soils and elevations shift across Laramie County, so your frost dates and drainage aren't the county average. 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 Laramie County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Laramie County — the short answer
Laramie County, Wyoming: USDA zone 5b, about 154 days between hard freezes, across 1.7M acres.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 6
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 7
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~154
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 1.7M acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are county 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 5b is Laramie County's average, not your lot's — a low corner or a tree line moves it. Against Laramie County's 154-day season, see what your own ground reads.
Heat in Laramie County
Across a year, Laramie County accumulates about 1,871 growing degree days above 50°F, about 3 fewer than the middle Wyoming county — ahead of 10 of Wyoming’s 23 counties. Degree days are the heat a crop actually gets to work with — more of them is more room to ripen a long-season crop before the freeze closes the window.
Grounded in PRISM Climate Group, Oregon State University — 1991–2020 monthly normals
Soil in Laramie County
Across Laramie County, the ground is predominantly Mollisols, where Altvan, Evanston, and Albinas are the most extensive named soil series. The soil is generally well drained with a loam surface. Topsoil pH runs about 7.2–7.9, slightly alkaline. Rainfall drains through hydrologic group B soils.
Soil order
Mollisols
Drainage
Well drained
Prime farmland
12%
Hydric soils
2%
Soil still varies lot by lot — soil types explained.
How the ground varies across Laramie County
The USDA soil survey maps 90% of Laramie County as well drained — but another 7% drains differently: 5% excessively drained, 1% poorly drained.
Altvan is the most extensive named soil at 12% of mapped acres, then Evanston (12%) and Albinas (7%).
Which of them your own lot sits on is a parcel question, not a county one. Check your address for the survey at your boundary.
What this means for growing in Laramie County
Each reading below is measured for Laramie County itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Drainage
MeasuredThe dominant soils across Laramie County are well drained, in hydrologic group B — ground that drains quickly.
The upside is soil you can work early in spring and roots that never drown; the cost is that fast-draining ground dries out fast and leaches nutrients away before plants can use them.
Work in compost and mulch to hold moisture and feed, and water more often in short doses than deep and rarely.
USDA NRCS SSURGO
Surface pH
MeasuredTopsoil across Laramie County runs about pH 7.2–7.9, on the alkaline side.
Many vegetables cope, but acid-lovers like blueberries struggle, and iron and manganese lock up above about pH 7.5 — leaves yellow between the veins even in rich soil.
Elemental sulfur and generous organic matter lower pH slowly for the beds that need it; test first so you add only what the soil actually calls for.
USDA NRCS SSURGO
Season length
MeasuredLaramie County runs about 154 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
MeasuredLaramie County sits in USDA hardiness zone 5b.
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 Laramie County is in
Laramie County spans 2 EPA Level III ecoregions — High Plains (82%) and Southern Rockies (18%). Which one your land falls in changes what grows wild there and how the ground behaves, and a county-wide answer cannot tell you which.
What Grows in Laramie County
We scored all 1,086 plants against Laramie County's own USDA zone 5b and its own 154-day season between hard freezes, using the same matching engine that runs a full parcel report. These cleared both. Sun, soil pH and drainage vary lot by lot — those are the parcel questions below. Each card opens that plant's Wyoming profile.
Is it too late to plant in Laramie County?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Apr 8; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 6 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 7 — long-season crops need about 90 days of runway, quick greens only 30. Late in the year the fall bench takes over — quick greens, radishes, and garlic that repays you next summer.
Documented around Laramie County
- monarch butterfly2 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Laramie County
USGS estimates 64,967 lb of 2,4-d on Laramie County farmland in 2019, its largest by weight, ahead of Glyphosate (58,333 lb) and Atrazine (34,662 lb).
Farmland across the whole county, not any one lot. Check your address for the site-by-site record.
Safe to Grow Here?
What the federal record shows across Laramie County — and how to grow with it.
We checked the federal record across Laramie County — 1,007 documented sites across 8 of the 9 source types we track.
The most significant on record: 13 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
There's a meaningful federal record across Laramie County — worth a look before you plant food, not a reason to hold back from growing. Proximity to a documented site is information, not a diagnosis of any one yard. A soil test before new food beds is the sensible precaution here, and the map shows exactly which sites sit where, so you can see what's actually near you.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Laramie County
Closest first, across Laramie County. Listing isn't leaking, and distance isn't exposure.
- Carbonate Belle ClaimMining · 1.9 mi
- Grant ClaimMining · 1.9 mi
- Pacific LodeMining · 1.9 mi
- Don BerryUnderground Storage Tanks · 3.3 mi
- 16-065-14daa01Nitrate · 4.8 mi
- School Bus BarnUnderground Storage Tanks · 5.4 mi
- 16-065-03cca01Nitrate · 6.0 mi
- 15-066-16dbb01Nitrate · 6.3 mi
- 15-066-16dbb02Nitrate · 6.4 mi
- 16-065-03bbb01Nitrate · 6.7 mi
- 15-064-32cdc01Nitrate · 6.9 mi
- WARREN F.E. AFB ATLAS "D" MISSILE SITE # 2Superfund · 7.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Laramie County'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 Laramie County.
Severity Distribution
across Laramie County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Laramie County, two things run higher than the national average across Laramie County — Nitrate (362 sites) and CAFO (10 sites). 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.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Laramie County
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 Laramie County average
Your land is one point inside Laramie County
Everything above resolves to Laramie County as a whole — one PHZM band and one county frost record, read across 1.7M 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 county 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 county average.
Your Lot vs the Laramie County Average
Laramie County Average
- ●USDA Zones 5b, averaged across Laramie County
- ●One soil character for all of Laramie County
- ●Frost dates read at Laramie County's scale: May 6 to Oct 7
YOUR Parcel
- ✓Your exact zone, not Laramie County's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Laramie County
Pull a site-specific report for your exact address in Laramie County, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Laramie County averages can't show:
We read public map data around Laramie County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Laramie County average
How we know this about Laramie County
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at county grain; hard-freeze dates from NOAA 1991–2020 28°F normals at this county’s own record where one resolves, and the labelled statewide window where none does; soils from the USDA NRCS SSURGO survey, area-weighted across the county’s own map units; boundaries and acreage from US Census TIGER/Line 2025; the contamination and pesticide records from the federal sources named in their beats above. Where Laramie County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Laramie County
When does frost risk typically end in Laramie County?
The last hard freeze (28°F) in Laramie County typically lands around May 6, 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 27.
How long is the growing season in Laramie County?
Measured between 28°F hard freezes, Laramie County sees about 154 frost-free days — roughly May 6 through Oct 7, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 27 to Sep 23, about 119 days.
Is the soil safe to grow vegetables in Laramie County?
The federal record around Laramie County is a meaningful one — 1,007 documented sites, mostly Underground Storage Tanks entries (385), the nearest Mining record about 1.9 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.
Everything above is measured at Laramie County's scale — its 5b band and its 154-day season. Your yard writes its own version of Laramie County's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
Will It Grow Here?
Zone fit is the first question — each answer below reads Wyoming's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Laramie County’s own scale
9 of the readings below were taken at Laramie County's own scale — its own ~154-day span between 28°F freezes, the 3 most extensive soil series mapped here and 1,007 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Laramie County's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Laramie County's own 28°F hard-freeze dates and its ~154-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Laramie CountyUSDA NRCS SSURGO
- 1,007 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Mining record about 1.9 miles outFederal environmental registers
- Laramie County's boundary and the 1,718,951 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~154-day seasonGrowable Ground crop-matching engine
- The 2 ecoregions Laramie County spans, High Plains the largestUS EPA Level III Ecoregions
- Open occurrence records documented in Laramie County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Laramie County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Wyoming grower plans around — written at state scale, so they stay on the state guidefrom Wyoming
What this page can’t tell you
- How the season shifts across Laramie County — the ~154 days above is one reading at its centre; the 12 towns below each carry their owntowns in this county →
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Laramie County's 1,718,951 acreswhy one lot differs from the next →
- Which of those 1,007 documented sites actually reaches your soil — that needs your address, the wind, and the groundwater directionhow we read the record →
- Where cold air settles, which slopes face the sun, and which way the wind runs on your own ground — none of it survives being averaged over Laramie Countyread your own land →