Lyman, Wyoming, sits in USDA hardiness zone 5a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
On paper, cabbage, cranberry, lavender, and collard greens all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Lyman, 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 Lyman 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 Lyman — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Lyman — the short answer
Lyman, Wyoming: USDA zone 5a, about 131 days between hard freezes, across 1K acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 26
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~131
- 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 Lyman's average, not your lot's — a low corner or a tree line moves it. Against Lyman's 131-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Lyman
Each reading below is measured for Lyman itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredLyman runs about 131 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
MeasuredLyman 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 Lyman is in
Lyman sits in the Wyoming Basin — EPA Level III, inside the wider North American Deserts. That is read at Lyman's own centroid rather than borrowed from Uinta County.
What Grows in Lyman
Every plant below cleared Lyman's own zone 5a and its 131-day season. Each card opens that plant's Wyoming profile. How we score.
Is it too late to plant in Lyman?
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 20; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 18 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 26 — 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 Lyman
Closest first, within ~10 miles of Lyman. Listing isn't leaking, and distance isn't exposure.
- 16-114-31add01Nitrate · 950 ft
- Birch Construction CompanyUnderground Storage Tanks · 950 ft
- H&M OIL COMPANYBrownfields · 1000 ft
- Town ShopUnderground Storage Tanks · 1100 ft
- Former Kum and Go #965Underground Storage Tanks · 1200 ft
- Church Buttes PlantUnderground Storage Tanks · 1200 ft
- Maverik Country Store # 136Underground Storage Tanks · 1500 ft
- Town HallUnderground Storage Tanks · 1500 ft
- VALLEY WEST CLEANERSBrownfields · 1600 ft
- Bridger Valley MotorsUnderground Storage Tanks · 1600 ft
- Lyberg's Nutrition CenterUnderground Storage Tanks · 1700 ft
- 16-114-32bdb01Nitrate · 1800 ft
6 more sites are on the record inside the same radius. See them on the map
Measured from Lyman'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 Lyman.
Total Sites
71
within ~10 miles of Lyman
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Lyman
Severity Distribution
within ~10 miles of Lyman
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Lyman, Nitrate runs higher than the national average — 36 sites within ~10 miles of Lyman. 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 Lyman
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 Lyman average
Your land is one point inside Lyman
Everything above resolves to Lyman 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 Lyman Average
Lyman Average
- ●USDA Zones 5a, averaged across Lyman
- ●One soil character for all of Lyman
- ●Frost dates read at Lyman's scale: May 18 to Sep 26
YOUR Parcel
- ✓Your exact zone, not Lyman's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Lyman
Pull a site-specific report for your exact address in Lyman, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Lyman averages can't show:
We read public map data around Lyman — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Lyman average
How we know this about Lyman
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 Lyman’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 Lyman
When does frost risk typically end in Lyman?
The last hard freeze (28°F) in Lyman typically lands around May 18, 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 8.
When is the first frost in Lyman?
The first hard freeze (28°F) in Lyman typically arrives around Sep 26, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 12, so the watching starts about Aug 27 — about 131 days after the spring freeze cleared.
How long is the growing season in Lyman?
Measured between 28°F hard freezes, Lyman sees about 131 frost-free days — roughly May 18 through Sep 26, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 8 to Sep 12, about 96 days.
Is the soil safe to grow vegetables in Lyman?
The federal record around Lyman shows 71 documented sites, mostly Nitrate entries (36), the nearest Nitrate record about 0.2 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do gardeners stretch the season in Lyman?
With about 131 frost-free days between hard freezes, Lyman 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 159 to 187 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 18 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Lyman's scale — its 5a band and its 131-day season. Your yard writes its own version of Lyman'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 Lyman’s own scale
6 of the readings below were taken at Lyman's own scale — its own ~131-day season between 28°F freezes, the 1,006 acres it covers and 71 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Lyman's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Lyman's own 28°F hard-freeze dates, about May 18 and Sep 26 and the ~131-day span between themNOAA 1991–2020 Climate Normals
- 71 documented contamination sites on the federal record near Lyman, the closest Nitrate record about 0.2 miles out from the town centreFederal environmental registers
- Lyman's boundary and the 1,006 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~131-day seasonGrowable Ground crop-matching engine
- The ecoregion at Lyman's own centroid, the Wyoming BasinUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Lyman's 1,006 acres read through its county's SSURGO summaryfrom Uinta County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Uinta 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 Uinta County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Lyman's 1,006 acreswhy one lot differs from the next →
- Which side of Lyman you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,006 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.2 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 Lyman-wide figureread your own land →
More in Wyoming
Wider growing context
What grows across WyomingLyman sits outside our named growing regions, so Wyoming as a whole is its closest context here.
Nearby growing guides