Herriman, Utah, sits in USDA hardiness zone 7a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
A short list that earns its place here — cabbage, hazelnut, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Herriman, 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 Herriman 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 Herriman — soil, climate, flood, and parcel records. How we handle your address.
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Herriman — the short answer
Herriman, Utah: USDA zone 7a, about 210 days between hard freezes, across 15K 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
- 15K 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 Herriman's average, not your lot's — a low corner or a tree line moves it. Against Herriman's 210-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Herriman
Each reading below is measured for Herriman itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredHerriman 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
MeasuredHerriman 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 Herriman is in
Herriman sits in the Central Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Herriman's own centroid rather than borrowed from Salt Lake County.
What Grows in Herriman
Every plant below cleared Herriman'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 Herriman?
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. Here the season winds down slowly: late sowings, a real autumn harvest, and garlic in the ground before the first hard freeze.
What's on the federal record near Herriman
Closest first, within ~10 miles of Herriman. Listing isn't leaking, and distance isn't exposure.
- HOLIDAY OIL #2Underground Storage Tanks · 0.6 mi
- (C- 4- 2) 1bbb- 1Nitrate · 1.1 mi
- SMITH'S #108Brownfields · 1.1 mi
- WALGREENS STORE #11524Brownfields · 1.1 mi
- SMITHS #108Underground Storage Tanks · 1.1 mi
- WALMART NEIGHBORHOOD MARKET #7168Brownfields · 1.2 mi
- CVS PHARMACY #10308Brownfields · 1.3 mi
- HAMILTON LAND & LIVESTOCKUnderground Storage Tanks · 1.4 mi
- HARMONS GROCERY - RIVERTON #82Underground Storage Tanks · 1.5 mi
- (C- 3- 1)31ccb- 1Nitrate · 1.5 mi
- (C- 4- 1) 6acb- 1Nitrate · 1.5 mi
- HOLIDAY OIL #36Underground Storage Tanks · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Herriman'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 Herriman.
Sources Checked
within ~10 miles of Herriman
Severity Distribution
within ~10 miles of Herriman
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Herriman, two things run higher than the national average within ~10 miles of Herriman — Mining (186 sites) and PFAS (10 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.
PFAS: PFAS (per- and polyfluoroalkyl substances) are called "forever chemicals" because they do not biodegrade.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Test irrigation water source — this is the primary pathway for PFAS to reach garden crops.
Check your specific parcel in Herriman
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 Herriman average
Your land is one point inside Herriman
Everything above resolves to Herriman as a whole — one PHZM band and one 28°F frost record, read across 15K 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 Herriman Average
Herriman Average
- ●USDA Zones 7a, averaged across Herriman
- ●One soil character for all of Herriman
- ●Frost dates read at Herriman's scale: Apr 4 to Oct 31
YOUR Parcel
- ✓Your exact zone, not Herriman's 7a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Herriman
Pull a site-specific report for your exact address in Herriman, Utah — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Herriman averages can't show:
We read public map data around Herriman — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Herriman average
How we know this about Herriman
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 Herriman’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 Herriman
When does frost risk typically end in Herriman?
The last hard freeze (28°F) in Herriman 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 Herriman?
The first hard freeze (28°F) in Herriman 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 Herriman?
Measured between 28°F hard freezes, Herriman 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 Herriman?
The federal record around Herriman runs heavier than most — 1,064 documented sites, mostly Underground Storage Tanks entries (328), the nearest Underground Storage Tanks record about 0.6 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 Herriman?
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 Herriman's scale — its 7a band and its 210-day season. Your yard writes its own version of Herriman'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 Herriman’s own scale
6 of the readings below were taken at Herriman's own scale — its own ~210-day season between 28°F freezes, the 14,820 acres it covers and 1,064 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Herriman's own USDA hardiness band, zones 7aUSDA PHZM 2023
- Herriman's own 28°F hard-freeze dates, about Apr 4 and Oct 31 and the ~210-day span between themNOAA 1991–2020 Climate Normals
- 1,064 documented contamination sites on the federal record near Herriman, the closest Underground Storage Tanks record about 0.6 miles out from the town centreFederal environmental registers
- Herriman's boundary and the 14,820 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 Herriman'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 Herriman's 14,820 acres read through its county's SSURGO summaryfrom Salt Lake County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Salt Lake 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 Salt Lake County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Herriman's 14,820 acreswhy one lot differs from the next →
- Which side of Herriman you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 14,820 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.6 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 Herriman-wide figureread your own land →
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