Coalville, Utah, sits in USDA hardiness zone 5b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Among the crops suited to this profile: cabbage, cranberry, lavender, and collard greens. The site-level story — soil, sun, drainage — decides the rest.
Even in Coalville, 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 Coalville 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 Coalville — soil, climate, flood, and parcel records. How we handle your address.
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Coalville — the short answer
Coalville, Utah: USDA zone 5b, about 146 days between hard freezes, across 4K acres of city.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 11
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 4
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~146
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 4K 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 5b is Coalville's average, not your lot's — a low corner or a tree line moves it. Against Coalville's 146-day season, see what your own ground reads.
Your town runs its own season
Coalville's own 30-year record measures about 146 days between 28°F killing freezes — 48 days longer than Summit County's ~98. Both are measured records, not estimates.
That gap is the whole reason a county average can mislead here. Plant against Coalville's ~146-day season rather than the county figure — and the sun, slope and cold-air drainage on your specific lot move it again.
NOAA Regional Climate Centers ACIS (1991–2020), 30-year daily minimum record. Both figures are measured records — this town’s own and its county’s. A town with no record of its own is absent here rather than estimated.
Soil varies lot by lot — soil types explained.
What this means for growing in Coalville
Each reading below is measured for Coalville itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredCoalville runs about 146 days between hard freezes — a short growing season.
Long-maturing crops like melons, sweet potatoes, and winter squash can run out of runway before the first hard freeze, ripening late or not at all.
Lead with fast-maturing varieties, and stretch the season on both ends with cold frames, low tunnels, or a greenhouse.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredCoalville sits in USDA hardiness zone 5b.
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 Coalville is in
Coalville sits in the Wasatch and Uinta Mountains — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Coalville's own centroid rather than borrowed from Summit County.
What Grows in Coalville
Every plant below cleared Coalville's own zone 5b and its 146-day season. Each card opens that plant's Utah profile. How we score.
Is it too late to plant in Coalville?
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 Apr 13; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 11 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 4 — long-season crops need about 90 days of runway, quick greens only 30. When the window is tight, the fall moves are quick ones — baby greens, radishes, and garlic set for next season.
Documented around Coalville
Spotted lanternfly documented 26 miles from Coalville, first recorded 2020. What to watch for.
What's on the federal record near Coalville
Closest first, within ~10 miles of Coalville. Listing isn't leaking, and distance isn't exposure.
- BELL'S HOLIDAY HILLSUnderground Storage Tanks · 0.9 mi
- COALVILLEUnderground Storage Tanks · 1.3 mi
- BELL BROS. OIL COMPANY-SINCLAIRUnderground Storage Tanks · 1.3 mi
- BULK PLANTUnderground Storage Tanks · 1.3 mi
- MOORES CHEVRON SERVICEUnderground Storage Tanks · 1.3 mi
- MOORE MOTOR COUnderground Storage Tanks · 1.3 mi
- GEARY'S CONOCOUnderground Storage Tanks · 1.3 mi
- UTELITEToxics Release Inventory · 1.3 mi
- GRIFFITHS FOOD TOWNUnderground Storage Tanks · 1.3 mi
- BRISTOW'SUnderground Storage Tanks · 1.4 mi
- SUMMIT COUNTY COURTHOUSEUnderground Storage Tanks · 1.4 mi
- COALVILLE CITY SHOPSUnderground Storage Tanks · 1.4 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Coalville'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 Coalville.
Total Sites
41
within ~10 miles of Coalville
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Coalville
Severity Distribution
within ~10 miles of Coalville
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Coalville, Underground Storage Tanks runs higher than the national average — 37 sites within ~10 miles of Coalville. That's not a problem with your land — it's information about it.
Underground Storage Tanks: Underground storage tanks are the single most common source of soil contamination near homes and gardens.
Use raised beds with imported soil — this eliminates the primary soil-contact pathway.
Check your specific parcel in Coalville
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 Coalville average
Your land is one point inside Coalville
Everything above resolves to Coalville as a whole — and this is a city whose own 30-year record already runs a season its county’s does not. Your parcel sits at one point inside even that. 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 Coalville Average
Coalville Average
- ●USDA Zones 5b, averaged across Coalville
- ●One soil character for all of Coalville
- ●Frost dates read at Coalville's scale: May 11 to Oct 4
YOUR Parcel
- ✓Your exact zone, not Coalville's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Coalville
Pull a site-specific report for your exact address in Coalville, Utah — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Coalville averages can't show:
We read public map data around Coalville — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Coalville average
How we know this about Coalville
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 Coalville’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 Coalville
When does frost risk typically end in Coalville?
The last hard freeze (28°F) in Coalville typically lands around May 11, 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 Jun 1.
When is the first frost in Coalville?
The first hard freeze (28°F) in Coalville typically arrives around Oct 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 20, so the watching starts about Sep 4 — about 146 days after the spring freeze cleared.
How long is the growing season in Coalville?
Measured between 28°F hard freezes, Coalville sees about 146 frost-free days — roughly May 11 through Oct 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 1 to Sep 20, about 111 days.
Is the soil safe to grow vegetables in Coalville?
The federal record around Coalville is light — 41 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (37), the nearest Underground Storage Tanks record about 0.9 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do gardeners stretch the season in Coalville?
With about 146 frost-free days between hard freezes, Coalville rewards the classic extension moves: floating row cover buys roughly two to four extra weeks at each shoulder — on this season that is a working window nearer 174 to 202 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 11 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Coalville's scale — its 5b band and its 146-day season. Your yard writes its own version of Coalville'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 Coalville’s own scale
7 of the readings below were taken at Coalville's own scale — its own ~146-day season between 28°F freezes, the 3,950 acres it covers and 41 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Coalville's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Coalville's own 28°F hard-freeze dates, about May 11 and Oct 4 and the ~146-day span between themNOAA 1991–2020 Climate Normals
- 41 documented contamination sites on the federal record near Coalville, the closest Underground Storage Tanks record about 0.9 miles out from the town centreFederal environmental registers
- Coalville's boundary and the 3,950 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~146-day seasonGrowable Ground crop-matching engine
- The ecoregion at Coalville's own centroid, the Wasatch and Uinta MountainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Coalvillelydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Coalville's 3,950 acres read through its county's SSURGO summaryfrom Summit County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Summit 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 Summit County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Coalville's 3,950 acreswhy one lot differs from the next →
- Which side of Coalville you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,950 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.9 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 Coalville-wide figureread your own land →