Grantsville, Utah, sits in USDA hardiness zone 7a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Growers here do well with cabbage, hazelnut, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Grantsville, 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 Grantsville 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 Grantsville — soil, climate, flood, and parcel records. How we handle your address.
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Grantsville — the short answer
Grantsville, Utah: USDA zone 7a, about 210 days between hard freezes, across 26K acres of city.
- USDA zone
- 7a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~210
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 26K 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 7a is Grantsville's average, not your lot's — a low corner or a tree line moves it. Against Grantsville's 210-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Grantsville
Each reading below is measured for Grantsville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredGrantsville runs about 210 days between hard freezes — a long growing season.
There is slack for succession plantings and slow-finishing crops: many vegetables can be sown twice, and the heat-lovers have time to ripen fully.
Plan a second sowing of quick crops after the first comes out, and use the fall window most gardeners let sit idle.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredGrantsville sits in USDA hardiness zone 7a.
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 Grantsville is in
Grantsville sits in the Central Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Grantsville's own centroid rather than borrowed from Tooele County.
What Grows in Grantsville
Every plant below cleared Grantsville's own zone 7a and its 210-day season. Each card opens that plant's Utah profile. How we score.
Is it too late to plant in Grantsville?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Mar 7; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 4 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 31 — long-season crops need about 90 days of runway, quick greens only 30. A long window like this one runs successions deep into fall — and even its last weeks take quick greens and garlic.
What's on the federal record near Grantsville
Closest first, within ~10 miles of Grantsville. Listing isn't leaking, and distance isn't exposure.
- LHOIST NORTH AMERICA - PLANT & QUARRYToxics Release Inventory · 2200 ft
- GRANTSVILLE CITY MAINT. SHOPUnderground Storage Tanks · 0.8 mi
- GRANTSVILLE WAY STATION ASSOC.Underground Storage Tanks · 0.8 mi
- GRANTSVILLE ELEMENTARYUnderground Storage Tanks · 0.9 mi
- HALES OIL COMPANY, INC.Underground Storage Tanks · 0.9 mi
- FIVE STAR AUTO QUICK LUBEUnderground Storage Tanks · 0.9 mi
- DARRELL J. DIDERICKSEN & SONSUnderground Storage Tanks · 0.9 mi
- HILL BROTHERS CHEMICAL COToxics Release Inventory · 1.0 mi
- UDOT STA. # 2422Underground Storage Tanks · 1.0 mi
- UDOT MAINT. YARD #222 UHP PUMPUnderground Storage Tanks · 1.0 mi
- QUICK STOPUnderground Storage Tanks · 1.0 mi
- LAWRENCE'S TEXACOUnderground Storage Tanks · 1.1 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Grantsville'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 Grantsville.
Sources Checked
within ~10 miles of Grantsville
Severity Distribution
within ~10 miles of Grantsville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Grantsville, two things run higher than the national average within ~10 miles of Grantsville — Mining (30 sites) and CAFO (3 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
CAFO: CAFOs pose a different contamination profile than chemical sources.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Wash all produce consumed raw thoroughly, especially leafy greens grown near CAFOs.
Check your specific parcel in Grantsville
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 Grantsville average
Your land is one point inside Grantsville
Everything above resolves to Grantsville as a whole — one PHZM band and one 28°F frost record, read across 26K 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 city 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 Grantsville Average
Grantsville Average
- ●USDA Zones 7a, averaged across Grantsville
- ●One soil character for all of Grantsville
- ●Frost dates read at Grantsville's scale: Apr 4 to Oct 31
YOUR Parcel
- ✓Your exact zone, not Grantsville's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Grantsville
Pull a site-specific report for your exact address in Grantsville, Utah — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Grantsville averages can't show:
We read public map data around Grantsville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Grantsville average
How we know this about Grantsville
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this city’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Grantsville’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 city grain anywhere on this page — there is no city-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 Grantsville
When does frost risk typically end in Grantsville?
The last hard freeze (28°F) in Grantsville typically lands around Apr 4, 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 Apr 25.
When is the first frost in Grantsville?
The first hard freeze (28°F) in Grantsville typically arrives around Oct 31, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 17, so the watching starts about Oct 1 — about 210 days after the spring freeze cleared.
How long is the growing season in Grantsville?
Measured between 28°F hard freezes, Grantsville sees about 210 frost-free days — roughly Apr 4 through Oct 31, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Apr 25 to Oct 17, about 175 days.
Is the soil safe to grow vegetables in Grantsville?
The federal record around Grantsville runs heavier than most — 154 documented sites, mostly Underground Storage Tanks entries (41), the nearest Toxics Release Inventory record about 0.4 miles out — so test the soil before planting food in the ground, and raised beds with clean imported soil grow well in the meantime. Even here, proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what's recorded and where.
How do I protect my plants from frost in Grantsville?
From about Oct 1 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 31 (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 31. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Grantsville's scale — its 7a band and its 210-day season. Your yard writes its own version of Grantsville'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 Grantsville’s own scale
6 of the readings below were taken at Grantsville's own scale — its own ~210-day season between 28°F freezes, the 25,524 acres it covers and 154 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Grantsville's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Grantsville's own 28°F hard-freeze dates, about Apr 4 and Oct 31 and the ~210-day span between themNOAA 1991–2020 Climate Normals
- 154 documented contamination sites on the federal record near Grantsville, the closest Toxics Release Inventory record about 0.4 miles out from the town centreFederal environmental registers
- Grantsville's boundary and the 25,524 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 7a and a ~210-day seasonGrowable Ground crop-matching engine
- The ecoregion at Grantsville's own centroid, the Central Basin and RangeUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Grantsville's 25,524 acres read through its county's SSURGO summaryfrom Tooele County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Tooele 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 Tooele County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Grantsville's 25,524 acreswhy one lot differs from the next →
- Which side of Grantsville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 25,524 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Toxics Release Inventory record about 0.4 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 Grantsville-wide figureread your own land →
More in Utah
Wider growing context
What grows across UtahGrantsville sits outside our named growing regions, so Utah as a whole is its closest context here.
Nearby growing guides