Tooele County, in Utah, sits in USDA hardiness zone 6b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
Expect cabbage, blackberry, california poppy, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Grounded in USDA PHZM 2023 · Growable Ground suitability scoring · NOAA 1991–2020 Climate Normals
Tooele County holds more than one microclimate.
Soils and elevations shift across Tooele 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 Tooele County — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Tooele County — the short answer
Tooele County, Utah: USDA zone 6b, about 191 days between hard freezes, across 4.5M acres.
- USDA zone
- 6b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 12
- NOAA 1991–2020 Climate Normals, 28°F
- First hard freeze (28°F)
- Oct 20
- NOAA 1991–2020 Climate Normals, 28°F
- Days between freezes
- ~191
- NOAA 1991–2020 Climate Normals, 28°F
- County area
- 4.5M 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 6b is Tooele County's average, not your lot's — a low corner or a tree line moves it. Against Tooele County's 191-day season, see what your own ground reads.
Heat in Tooele County
Across a year, Tooele County accumulates about 3,149 growing degree days above 50°F, about 637 more than the middle Utah county — ahead of 23 of Utah’s 29 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 Tooele County
Across Tooele County, the ground is predominantly Entisols, where Skumpah, Tooele, and Saltair are the most extensive named soil series. The soil is generally well drained with a stratified silty clay loam to silt loam to very fine sand surface. Topsoil pH runs about 8.2–8.5, moderately alkaline. Rainfall drains through hydrologic group D soils.
Soil order
Entisols
Drainage
Well drained
Hydric soils
41%
Soil still varies lot by lot — soil types explained.
How the ground varies across Tooele County
The USDA soil survey maps 40% of Tooele County as well drained — but another 54% drains differently: 32% very poorly drained, 17% somewhat excessively drained.
Skumpah is the most extensive named soil at 8% of mapped acres, then Tooele (7%) and Saltair (6%).
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 Tooele County
Each reading below is measured for Tooele 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 Tooele County are well drained, in hydrologic group D — 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 Tooele County runs about pH 8.2–8.5, 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
Wet ground
MeasuredAbout 41% of Tooele County is mapped as hydric — wetland — soil.
If your lot falls in one of those pockets, a standard in-ground bed will fight waterlogging all season, and roots that need air will struggle.
Check how your own ground drains before you dig; raised beds or moisture-loving plantings turn a wet corner from a problem into a niche.
USDA NRCS SSURGO
Season length
MeasuredTooele County runs about 191 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
The kind of country Tooele County is in
Tooele County sits in the Central Basin and Range — EPA Level III, inside the wider North American Deserts. One consistent ecological setting across the whole county.
What Grows in Tooele County
We scored all 1,086 plants against Tooele County's own USDA zone 6b and its own 191-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 Utah profile.
Is it too late to plant in Tooele County?
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 Mar 15; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 12 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 20 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
Documented around Tooele County
- monarch butterfly4 documented records
Sighting records, so they follow observers as much as insects.
What gets applied to farmland in Tooele County
USGS estimates 2,856 lb of 2,4-d on Tooele County farmland in 2019, its largest by weight, ahead of Chlorpyrifos (1,018 lb) and Glyphosate (930 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 Tooele County — and how to grow with it.
We checked the federal record across Tooele County — 1,232 documented sites across 8 of the 9 source types we track.
The most significant on record: 35 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Tooele County carries one of the heavier federal records we track — and that's not a verdict on your yard. Proximity to a documented site is information, not a diagnosis: nothing here says any particular parcel is affected. It does earn one concrete step — before food beds go in the ground, a professional soil test tells you exactly what you're working with, and raised beds with clean imported soil grow well almost anywhere in the meantime.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
What's on the federal record near Tooele County
Closest first, across Tooele County. Listing isn't leaking, and distance isn't exposure.
- Probert MineMining · 1.2 mi
- Timpie CanyonMining · 1.2 mi
- ENSIGN RANCHESCAFO · 5.6 mi
- Silver Queen MineMining · 9.0 mi
- U.S. AIR FORCE HILL AIR FORCEUnderground Storage Tanks · 9.6 mi
- GRANTSVILLE CITYPFAS · 11.5 mi
- (C- 4- 9)32abb- 1Nitrate · 12.8 mi
- ENERGYSOLUTIONS LLCBrownfields · 14.9 mi
- SKULL VALLEY-WHITE ROCK RANCH SHEEP BURIAL SITESSuperfund · 14.9 mi
- CLEAN HARBORS CLIVE, LLCToxics Release Inventory · 15.0 mi
- ENERGYSOLUTIONS LLCToxics Release Inventory · 15.9 mi
- Sunshine Mine (See Mercur District)Mining · 16.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Tooele 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 Tooele County.
Severity Distribution
across Tooele County
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Tooele County, two things run higher than the national average across Tooele County — Mining (696 sites) and Superfund (35 sites). That's not a problem with your land — it's information about 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.
Superfund: Superfund sites represent the most severe contamination in the federal system.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Commission professional soil testing before any food production (test for heavy metals, VOCs, and SVOCs).
Check your specific parcel in Tooele 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 Tooele County average
Your land is one point inside Tooele County
Everything above resolves to Tooele County as a whole — one PHZM band and one county frost record, read across 4.5M 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 Tooele County Average
Tooele County Average
- ●USDA Zones 6b, averaged across Tooele County
- ●One soil character for all of Tooele County
- ●Frost dates read at Tooele County's scale: Apr 12 to Oct 20
YOUR Parcel
- ✓Your exact zone, not Tooele County's 6b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your parcel in Tooele County
Pull a site-specific report for your exact address in Tooele County, Utah — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Tooele County averages can't show:
We read public map data around Tooele County — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Tooele County average
How we know this about Tooele 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 Tooele County carries no record of its own, the figure is inherited and labelled — the resolution ledger below names each.
Common questions about Tooele County
When does frost risk typically end in Tooele County?
The last hard freeze (28°F) in Tooele County typically lands around Apr 12, 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 3.
How long is the growing season in Tooele County?
Measured between 28°F hard freezes, Tooele County sees about 191 frost-free days — roughly Apr 12 through Oct 20, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 3 to Oct 6, about 156 days.
Is the soil safe to grow vegetables in Tooele County?
The federal record around Tooele County runs heavier than most — 1,232 documented sites, mostly Mining entries (696), the nearest Mining record about 1.2 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.
Everything above is measured at Tooele County's scale — its 6b band and its 191-day season. Your yard writes its own version of Tooele 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 Utah's frost window, season length, and soil profile against the plant's real requirements.
What this page reads at Tooele County’s own scale
9 of the readings below were taken at Tooele County's own scale — its own ~191-day span between 28°F freezes, the 3 most extensive soil series mapped here and 1,232 documented sites inside its boundary; one is borrowed from a wider read, named and linked below.
Measured here
- Tooele County's own USDA hardiness band, zones 6bUSDA PHZM 2023
- Tooele County's own 28°F hard-freeze dates and its ~191-day span between themNOAA 1991–2020 Climate Normals
- The soil order, drainage, surface pH, and the 3 most extensive named soil series mapped in Tooele CountyUSDA NRCS SSURGO
- 1,232 documented contamination sites inside the county boundary, distance-sorted from its center — the closest Mining record about 1.2 miles outFederal environmental registers
- Tooele County's boundary and the 4,505,769 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 6b and a ~191-day seasonGrowable Ground crop-matching engine
- Tooele County sitting wholly inside the Central Basin and RangeUS EPA Level III Ecoregions
- Open occurrence records documented in Tooele County for a tracked speciesGBIF derived datasets (CC0 / CC BY 4.0)
- Which agricultural compounds go onto Tooele County farmland, and roughly how muchUSGS NAWQA EPest county estimates
Inherited from a wider read
- The growing challenges every Utah grower plans around — written at state scale, so they stay on the state guidefrom Utah
What this page can’t tell you
- How the season shifts across Tooele County — the ~191 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 Tooele County's 4,505,769 acreswhy one lot differs from the next →
- Which of those 1,232 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 Tooele Countyread your own land →