Utah spans USDA hardiness zones 4a-9a, with a growing season of about 175 frost-free days — enough room for the full run of cool-season vegetables plus warm-season crops that finish before the first hard frost.
Those zone numbers rest on 5-20 inches of annual rainfall, a median of roughly 2,690 growing-degree days (base 50°F), and about 2,500 winter chill hours for tree fruit — the measurements that do the deciding. The prevailing soils — sandy loam, alkaline clay, desert sand, and lake sediment — differ most in how they drain, which is exactly where crop success is usually decided. Growing in Utah really means growing in one of its distinct regions — Wasatch Front, Uintah Basin, and Cache Valley — each with its own zone band and frost rhythm. On paper, cherry, peach, tomato, and sego lily all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Grounded inUSDA PHZM•NOAA Climate Normals•USDA NRCS SSURGO•GDD (PRISM 1991-2020 normals)•Chill hours (PRISM 1991-2020 normals)•USDA hardiness sub-region map•EPA FRS•USDA PLANTS•Growable Ground suitability scoring
Utah spans zones 4a-9a, but your yard sits in exactly one — and slope, tree cover, and low spots nudge it further. 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 Utah — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Distinct growing regions within Utah — each has its own zones, soils, and signature crops.
Utah: USDA zones 4a-9a, 98–237 frost-free days depending on the county, 29 counties.
The middle half of this state’s counties. Tender transplants usually wait 2–3 weeks past the last hard freeze. The shortest-season figure is Utah's own county record — Summit County's measured 28°F normal, not a modeled floor.
Utah does not have one growing season. Across the 333 of its 334 towns that carry their own 30-year record, the shortest measured season is Scofield's at 95 days and the longest is St. George's at 298 — a 203-day spread inside one state.
Neither end is a lone reading — one other town measures within 10 days of Scofield and 4 sit within 10 days of St. George. These are real pockets, so the number to plant against is your own town's, not the state average.
NOAA Regional Climate Centers ACIS (1991–2020), 30-year daily minimum record
Zone 4a-9a is Utah's average, not your lot's — a low corner or a tree line moves it. Against Utah's 175-day season, see what your own ground reads.
One answer for Utah averages 29 counties whose growing seasons are 139 days apart — from 98 frost-free days in Summit County to 237 in Washington County. That is the same state, measured the same way, in the same years. Which end of it your county sits nearer decides what finishes before the first hard freeze.
The middle half of 29 counties runs 156–195 days, with a median of 175 days — a 139-day span end to end.
Measured across 29 counties, each carrying its own 28°F normal. NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze. A county with no record of its own is absent from the range rather than counted as zero — nothing here is interpolated to the state. Your own site sits somewhere inside this range; a parcel report resolves where.
The middle half of Utah runs 156–195 frost-free days, and 14 of its 29 counties sit outside that — 7 on the short side, 7 on the long. A statewide planting date describes the middle well and the ends poorly, which is worth knowing before you follow one.
Under 156 frost-free days
7 counties
3 of 7 shown
The end of the state that sets the planting calendar — start seed indoors here and the season stretches to meet the crop.
156–195 frost-free days
15 counties
0 of 15 shown
The middle half of the state, and the part a single statewide date describes well.
Over 195 frost-free days
7 counties
3 of 7 shown
Long enough for a second succession of a quick crop after the first comes out.
Each county is placed by its own 28°F frost-free normal (NOAA Regional Climate Centers ACIS, 1991-2020, county 28°F killing freeze), the same figure its own guide page publishes. Elevation, slope and cold-air drainage move a yard within its county as well — which is the part only your address resolves.
The soil types that dominate Utah — how each drains decides more about crop success than almost anything else. Tap any soil to learn what it is and how to work with it. Each photo is a representative profile of that soil type; the named series is where it was documented, which is often another state.
Drainage
Fast. The sand fraction opens the soil up, so water moves through the root zone quickly and the surface rarely stays soggy. The trade is that nutrients ride out with the water.
What thrives
Root crops love it — carrots, potatoes, radishes, and onions size up cleanly in ground they can push through. Melons, sweet potatoes, asparagus, and most herbs appreciate the warmth and the drainage.
Clay with a high pH, common where limestone parent material or low rainfall keeps calcium carbonate in the profile. The chemistry changes which nutrients plants can reach — iron especially becomes hard to take up.
Drainage
Slow, like any clay — water is deliberate going in and deliberate leaving.
What thrives
Plants that evolved on limey ground shrug at the pH: asparagus, brassicas, beets, spinach, figs, lavender, and many stone fruits on tolerant rootstocks. Yellowing leaves with green veins on other plants is the iron signal to read.
Drainage
Very fast at the surface, though hard mineral layers can lurk beneath and pond water where you least expect.
What thrives
Desert natives are the honest first choice — mesquite, palo verde, agave, desert wildflowers. With shade cloth, drip irrigation, and compost, raised desert beds grow exceptional peppers, melons, and winter greens.
The floor of a vanished glacial lake — fine silt and clay that settled through still water for centuries, exposed as dead-flat, stone-free plains when the lakes drained.
Drainage
Slow. The flatness that makes lakebed ground easy to farm also gives water nowhere to go, and the fine texture holds it.
What thrives
Famously productive for sugar beets, beans, corn, and vegetables — old lakebeds are some of the most valuable farmland in the northern states.
Soil data: USDA NRCS SSURGO · Soil types explained
Plants well-suited to Utah's climate, soils, and growing season — each links to its full growing profile.
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Across Utah, cool-season planting typically opens about four weeks before the local last hard freeze — county medians put that freeze near Apr 26, with the middle half of counties between Apr 12 and May 6 (NOAA 1991–2020 climate normals). Tender transplants wait two to three weeks past it, and fall planting counts back from first freezes mostly between Oct 8 and Oct 27 — 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.
The plants Utah put its name on — cultural emblems, not growing recommendations.
Sego lily
Calochortus nuttallii
Designated 1911.
Populus tremuloides
Designated 2014. In our plant library — see its full growing profile.
Cherry
Designated 1997.
Spanish sweet onion
Designated 2002.
Plants the USDA PLANTS Database documents as native and present in Utah — a real per-state range, not just a zone match. Ordered by how closely each plant’s published hardiness range matches Utah’s zones 4a-9a, so this is a shortlist by climate fit, not a ranking of which plants matter most here. Presence is statewide, so a plant may still be uncommon in your specific county; your state’s Cooperative Extension or a native-plant society is the local authority.
US-native plants whose hardiness range overlaps Utah’s USDA zones 4a-9a but which USDA PLANTS doesn’t map to a single state range here. Zone overlap is a starting filter, not a range map.
What an experienced grower plans around here — each one has a move.
Very low rainfall — irrigation essential
Design the drip system before the beds — with mulch over it, high-desert ground grows on a fraction of the water you'd guess.
Alkaline soils (pH 7.5-8.5) limit many species
A soil test pins your actual pH — adapted species take the ground, acid-lovers take containers, nothing is off the table.
High altitude frost risk in mountain valleys
Mountain valleys trade on frost dates, not zone — know your real window and keep row covers close in the shoulder weeks.
For cultivar selection, pest pressure, and planting-time guidance specific to Utah, the Utah State University Extension is the authoritative local source.
Safe to Grow Here?What the federal record shows across Utah — and how to grow with it.
We checked the federal record across Utah — 17,478 documented sites across 8 of the 9 source types we track.
The most significant on record: 202 Superfund sites. Sites tracked in EPA's Superfund program — from assessment-stage CERCLIS entries to confirmed National Priorities List cleanup sites.
Utah 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.
Severity Distribution
across Utah
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Utah, Mining runs higher than the national average — 3,654 sites across Utah. 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.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Sources: EPA, USGS — 1.8M documented sites tracked nationwide across 9 federal source types.
Everything above resolves to Utah as a whole — a state whose own counties record seasons 139 days apart, and hardiness across zones 4a-9a. Your parcel sits at one point in that range, not in the middle of it. 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 state 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 statewide average.
State averages sketch the shape. Your soil, sun exposure, drainage, and microclimate decide what actually takes. Pull a site-specific report for your exact parcel.
Enter your address. We read your soil, sun, drainage, and frost dates, then score 1,086 plants against the real conditions on your land.
Three things about your lot that Utah averages can't show:
We read public map data around Utah — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Utah average
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read per county and aggregated to the state band; the growing season from NOAA Regional Climate Centers ACIS 1991–2020 28°F normals, read at each county’s own record; rainfall from NOAA Climate Normals; soils from USDA NRCS SSURGO; boundaries from US Census TIGER/Line 2025; the contamination record from the federal sources named in that beat above. Where a county carries no record of its own, it is absent from the figure rather than filled in.
Utah spans USDA hardiness zones 4a-9a — which is to say winter's coldest night runs from about −30°F to 25°F depending where in Utah you are, averaged over 1991–2020 (USDA PHZM 2023).
Too late for some crops, right on time for others — a growing season is a sequence, not a deadline. Across Utah, cool-season planting typically opens about four weeks before the local last hard freeze — county medians put that freeze near Apr 26, with the middle half of counties between Apr 12 and May 6 (NOAA 1991–2020 climate normals). Tender transplants wait two to three weeks past it, and fall planting counts back from first freezes mostly between Oct 8 and Oct 27 — 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.
Across Utah, the middle half of counties see their last hard freeze (28°F) between about Apr 12 and May 6, with a county median near Apr 26 (NOAA 1991–2020 climate normals). 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 17.
Measured between 28°F hard freezes, growing seasons across Utah's counties mostly run about 156 to 195 days, with a county median near 175 (NOAA 1991–2020 climate normals). Tender crops get a somewhat shorter practical window, since lighter frosts reach a few weeks past the hard-freeze dates on both ends.
Utah's zones 4a-9a support a wide range — strong performers include Cherry, Peach, Tomato, Sego Lily, and Blue Spruce. What actually takes on any one site comes down to its soil, sun, and drainage, and we score each plant against the real conditions at your address.
Officially, Utah spans USDA zones 4a-9a (USDA PHZM 2023) — but a zone is a 30-year average of winter's coldest night across an area, and it can't see any one yard. A south-facing slope, a tree line, or a low frost pocket can shift a single site by half a zone either way, which is why neighboring gardeners often quote different numbers. We read the conditions at your exact address — soil, sun, slope, and frost — and score 1,086 plants against what's actually there.
The federal record across Utah runs heavier than most — 17,478 documented sites, mostly Underground Storage Tanks entries (6,046) — 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.
Start with three facts. Utah spans USDA zones 4a-9a, which sets what survives winter; last hard freezes range from about Apr 12 to May 6 across its counties (NOAA 1991–2020 climate normals); and 17,478 documented sites sit on the federal record here, so a soil test before food beds is the smart first step. From there, matching plants to your actual soil and sun is the fun part.
Everything above is measured at Utah's scale — its 4a-9a band and its 175-day season. Your yard writes its own version of Utah's numbers: we read soil, sun, drainage and frost at your exact address. Try it for 14 days — no card required.
6 of the readings below were taken at Utah's own scale — the full zone 4a-9a span inside its borders, the 4 soil types that dominate its ground and 17,478 documented sites on its federal record; anything it cannot resolve at this scale is named below.
Measured here
What this page can’t tell you
Explore growing conditions by city or town in Utah.
Utah shares its dominant growing region with these states — a useful comparison if you're weighing where a crop will behave the same way.
