Rolling Hills, Wyoming, sits in USDA hardiness zone 5a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
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 Rolling Hills, 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 Rolling Hills 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 Rolling Hills — soil, climate, flood, and parcel records. How we handle your address.
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Rolling Hills — the short answer
Rolling Hills, Wyoming: USDA zone 5a, about 152 days between hard freezes, across 441 acres of town.
- USDA zone
- 5a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 6
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 5
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~152
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 441 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 Rolling Hills's average, not your lot's — a low corner or a tree line moves it. Against Rolling Hills's 152-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Rolling Hills
Each reading below is measured for Rolling Hills itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRolling Hills runs about 152 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
MeasuredRolling Hills 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 Rolling Hills is in
Rolling Hills sits in the Northwestern Great Plains — EPA Level III, inside the wider Great Plains. That is read at Rolling Hills's own centroid rather than borrowed from Converse County.
What Grows in Rolling Hills
Every plant below cleared Rolling Hills's own zone 5a and its 152-day season. Each card opens that plant's Wyoming profile. How we score.
Is it too late to plant in Rolling Hills?
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 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 5 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Rolling Hills
Closest first, within ~10 miles of Rolling Hills. Listing isn't leaking, and distance isn't exposure.
- Short SupplyUnderground Storage Tanks · 0.5 mi
- 34-075-27bca01Nitrate · 0.8 mi
- VALENTINE CONSTRUCTION INCBrownfields · 1.6 mi
- RED GIANT OIL COMPANY, LLCBrownfields · 1.7 mi
- 34-075-33ccc01Nitrate · 2.8 mi
- 33-075-04abb01Nitrate · 2.8 mi
- 33-075-04baa01Nitrate · 2.8 mi
- ROCK HARD CEMENTINGBrownfields · 2.9 mi
- Eastgate ServiceUnderground Storage Tanks · 3.0 mi
- MCGINLEY MANUFACTURINGBrownfields · 3.0 mi
- GLENROCK MOTORSPORTSBrownfields · 3.1 mi
- Victor N. OhmanUnderground Storage Tanks · 3.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Rolling Hills'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 Rolling Hills.
Total Sites
71
within ~10 miles of Rolling Hills
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Rolling Hills
Severity Distribution
within ~10 miles of Rolling Hills
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Rolling Hills, Nitrate runs higher than the national average — 34 sites within ~10 miles of Rolling Hills. 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 Rolling Hills
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 Rolling Hills average
Your land is one point inside Rolling Hills
Everything above resolves to Rolling Hills as a whole — one PHZM band and one 28°F frost record, read across 441 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 Rolling Hills Average
Rolling Hills Average
- ●USDA Zones 5a, averaged across Rolling Hills
- ●One soil character for all of Rolling Hills
- ●Frost dates read at Rolling Hills's scale: May 6 to Oct 5
YOUR Parcel
- ✓Your exact zone, not Rolling Hills's 5a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Rolling Hills
Pull a site-specific report for your exact address in Rolling Hills, Wyoming — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Rolling Hills averages can't show:
We read public map data around Rolling Hills — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Rolling Hills average
How we know this about Rolling Hills
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 Rolling Hills’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 Rolling Hills
When does frost risk typically end in Rolling Hills?
The last hard freeze (28°F) in Rolling Hills 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.
When is the first frost in Rolling Hills?
The first hard freeze (28°F) in Rolling Hills typically arrives around Oct 5, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 21, so the watching starts about Sep 5 — about 152 days after the spring freeze cleared.
How long is the growing season in Rolling Hills?
Measured between 28°F hard freezes, Rolling Hills sees about 152 frost-free days — roughly May 6 through Oct 5, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 27 to Sep 21, about 117 days.
Is the soil safe to grow vegetables in Rolling Hills?
The federal record around Rolling Hills is a meaningful one — 71 documented sites, mostly Nitrate entries (34), the nearest Underground Storage Tanks record about 0.5 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 I protect my plants from frost in Rolling Hills?
From about Sep 5 the job here turns from planting to protecting — the last start even a 30-day crop can finish. As the season closes around the first 28°F hard freeze near Oct 5 (NOAA 1991–2020 climate normals), three moves buy time: row cover or an old sheet over tender plants on still, clear nights; water the soil the afternoon before a freeze, so it holds warmth overnight; and harvest tomatoes, peppers and basil before Oct 5. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Rolling Hills's scale — its 5a band and its 152-day season. Your yard writes its own version of Rolling Hills'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 Rolling Hills’s own scale
6 of the readings below were taken at Rolling Hills's own scale — its own ~152-day season between 28°F freezes, the 441 acres it covers and 71 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Rolling Hills's own USDA hardiness band, zones 5aUSDA PHZM 2023
- Rolling Hills's own 28°F hard-freeze dates, about May 6 and Oct 5 and the ~152-day span between themNOAA 1991–2020 Climate Normals
- 71 documented contamination sites on the federal record near Rolling Hills, the closest Underground Storage Tanks record about 0.5 miles out from the town centreFederal environmental registers
- Rolling Hills's boundary and the 441 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5a and a ~152-day seasonGrowable Ground crop-matching engine
- The ecoregion at Rolling Hills's own centroid, the Northwestern Great PlainsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Rolling Hills's 441 acres read through its county's SSURGO summaryfrom Converse County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Converse 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 Converse County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Rolling Hills's 441 acreswhy one lot differs from the next →
- Which side of Rolling Hills you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 441 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.5 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 Rolling Hills-wide figureread your own land →
More in Wyoming
Wider growing context
What grows across WyomingRolling Hills sits outside our named growing regions, so Wyoming as a whole is its closest context here.
Nearby growing guides