Wallsburg, Utah, sits in USDA hardiness zone 6a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
The conditions favor cabbage, blackberry, california poppy, and collard greens, among others — though every individual site edits that list with its own soil, sun, and drainage.
Even in Wallsburg, 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 Wallsburg 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 Wallsburg — soil, climate, flood, and parcel records. How we handle your address.
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Wallsburg — the short answer
Wallsburg, Utah: USDA zone 6a, about 154 days between hard freezes, across 399 acres of town.
- USDA zone
- 6a
- 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 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~154
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 399 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 Wallsburg's average, not your lot's — a low corner or a tree line moves it. Against Wallsburg's 154-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Wallsburg
Each reading below is measured for Wallsburg itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredWallsburg 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
MeasuredWallsburg 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 Wallsburg is in
Wallsburg sits in the Wasatch and Uinta Mountains — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Wallsburg's own centroid rather than borrowed from Wasatch County.
What Grows in Wallsburg
Every plant below cleared Wallsburg's own zone 6a and its 154-day season. Each card opens that plant's Utah profile. How we score.
Is it too late to plant in Wallsburg?
Rarely: the season closes in stages, not all at once, and each stage has its crops. 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 Wallsburg
Spotted lanternfly documented 12 miles from Wallsburg, first recorded 2020. What to watch for.
What's on the federal record near Wallsburg
Closest first, within ~10 miles of Wallsburg. Listing isn't leaking, and distance isn't exposure.
- ELMO FORDUnderground Storage Tanks · 950 ft
- GIVENS ROUND VALLEY MARKETUnderground Storage Tanks · 1600 ft
- SHALLOW WELL MID VALLEY - WALLSBURGNitrate · 0.6 mi
- WELL UPPER VALLEY - WALLSBURGNitrate · 0.9 mi
- (D- 5 -4)13adc- 1Nitrate · 0.9 mi
- (D- 5- 5)19aac- 1Nitrate · 1.0 mi
- (D- 5- 5)20abb- 1Nitrate · 1.1 mi
- (D- 5- 5)19bca- 1Nitrate · 1.2 mi
- (D- 5- 5)17aca- 1Nitrate · 1.3 mi
- (D- 5- 4)12cad- 1Nitrate · 1.4 mi
- (D- 5- 4)12cad- 2Nitrate · 1.5 mi
- (D- 5- 4)12abd- 1Nitrate · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Wallsburg'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 Wallsburg.
Total Sites
203
within ~10 miles of Wallsburg
Risk Level
Elevated
Highest-severity
1 Superfund site (none NPL-listed)
Sources Checked
within ~10 miles of Wallsburg
Severity Distribution
within ~10 miles of Wallsburg
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Wallsburg, Nitrate runs higher than the national average — 140 sites within ~10 miles of Wallsburg. 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.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Wallsburg
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 Wallsburg average
Your land is one point inside Wallsburg
Everything above resolves to Wallsburg as a whole — one PHZM band and one 28°F frost record, read across 399 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 Wallsburg Average
Wallsburg Average
- ●USDA Zones 6a, averaged across Wallsburg
- ●One soil character for all of Wallsburg
- ●Frost dates read at Wallsburg's scale: May 6 to Oct 7
YOUR Parcel
- ✓Your exact zone, not Wallsburg's 6a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Wallsburg
Pull a site-specific report for your exact address in Wallsburg, Utah — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Wallsburg averages can't show:
We read public map data around Wallsburg — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Wallsburg average
How we know this about Wallsburg
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 Wallsburg’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 Wallsburg
When does frost risk typically end in Wallsburg?
The last hard freeze (28°F) in Wallsburg 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 Wallsburg?
The first hard freeze (28°F) in Wallsburg typically arrives around Oct 7, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 23, so the watching starts about Sep 7 — about 154 days after the spring freeze cleared.
How long is the growing season in Wallsburg?
Measured between 28°F hard freezes, Wallsburg 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 Wallsburg?
The federal record around Wallsburg is a meaningful one — 203 documented sites, mostly Nitrate entries (140), the nearest Underground Storage Tanks record about 0.2 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 Wallsburg?
From about Sep 7 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 7 (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 7. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Wallsburg's scale — its 6a band and its 154-day season. Your yard writes its own version of Wallsburg'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 Wallsburg’s own scale
7 of the readings below were taken at Wallsburg's own scale — its own ~154-day season between 28°F freezes, the 399 acres it covers and 203 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Wallsburg's own USDA hardiness band, zones 6aUSDA PHZM 2023
- Wallsburg's own 28°F hard-freeze dates, about May 6 and Oct 7 and the ~154-day span between themNOAA 1991–2020 Climate Normals
- 203 documented contamination sites on the federal record near Wallsburg, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Wallsburg's boundary and the 399 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6a and a ~154-day seasonGrowable Ground crop-matching engine
- The ecoregion at Wallsburg's own centroid, the Wasatch and Uinta MountainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Wallsburglydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Wallsburg's 399 acres read through its county's SSURGO summaryfrom Wasatch County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Wasatch County
- The growing challenges every Utah grower plans around — written at state scale, so they stay on the state guidefrom Utah
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Wasatch County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Wallsburg's 399 acreswhy one lot differs from the next →
- Which side of Wallsburg you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 399 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks 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 Wallsburg-wide figureread your own land →