Randolph, Utah, sits in USDA hardiness zone 4a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Expect zucchini, cranberry, cilantro, and okra to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Randolph, 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 Randolph 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 Randolph — soil, climate, flood, and parcel records. How we handle your address.
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Randolph — the short answer
Randolph, Utah: USDA zone 4a, about 101 days between hard freezes, across 822 acres of town.
- USDA zone
- 4a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 31
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 9
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~101
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 822 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 4a is Randolph's average, not your lot's — a low corner or a tree line moves it. Against Randolph's 101-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Randolph
Each reading below is measured for Randolph itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredRandolph runs about 101 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
MeasuredRandolph sits in USDA hardiness zone 4a.
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 Randolph is in
Randolph sits in the Wyoming Basin — EPA Level III, inside the wider North American Deserts. That is read at Randolph's own centroid rather than borrowed from Rich County.
What Grows in Randolph
Every plant below cleared Randolph's own zone 4a and its 101-day season. Each card opens that plant's Utah profile. How we score.
Is it too late to plant in Randolph?
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 May 3; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 31 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 9 — long-season crops need about 90 days of runway, quick greens only 30. In a season this compact, fast finishers and cold-hardy greens do the late work, and garlic tucked in before the freeze repays you next summer.
What's on the federal record near Randolph
Closest first, within ~10 miles of Randolph. Listing isn't leaking, and distance isn't exposure.
- UDOT STA. # 137AUnderground Storage Tanks · 1100 ft
- UDOT STA. #137Underground Storage Tanks · 2300 ft
- MAVERIK #160 RANDOLPHUnderground Storage Tanks · 0.6 mi
- MOUNTAIN MEADOW CAMPUnderground Storage Tanks · 5.4 mi
- Sioux ClaimMining · 8.3 mi
- Arickaree MineMining · 8.6 mi
- Mandan MineMining · 8.7 mi
- WOODRUFF COUNTRY STOREUnderground Storage Tanks · 9.7 mi
- UTAH POWER & LIGHT COMPANYUnderground Storage Tanks · 9.8 mi
Measured from Randolph'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 Randolph.
Severity Distribution
within ~10 miles of Randolph
Highest-Severity Sites
Know Before You Grow
- •Underground tanks leak petroleum as they age — near a former filling station, test the soil.
- •Mine waste leaches heavy metals. Test for lead, arsenic and cadmium before growing food here.
Check your specific parcel in Randolph
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 Randolph average
Your land is one point inside Randolph
Everything above resolves to Randolph as a whole — one PHZM band and one 28°F frost record, read across 822 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 town 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 Randolph Average
Randolph Average
- ●USDA Zones 4a, averaged across Randolph
- ●One soil character for all of Randolph
- ●Frost dates read at Randolph's scale: May 31 to Sep 9
YOUR Parcel
- ✓Your exact zone, not Randolph's 4a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Randolph
Pull a site-specific report for your exact address in Randolph, Utah — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Randolph averages can't show:
We read public map data around Randolph — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Randolph average
How we know this about Randolph
The datasets: hardiness from the USDA ARS Plant Hardiness Zone Map 2023, read at this town’s own centroid; hard-freeze dates from NOAA 1991–2020 28°F normals at Randolph’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 town grain anywhere on this page — there is no town-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 Randolph
When does frost risk typically end in Randolph?
The last hard freeze (28°F) in Randolph typically lands around May 31, 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 21.
When is the first frost in Randolph?
The first hard freeze (28°F) in Randolph typically arrives around Sep 9, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Aug 26, so the watching starts about Aug 10 — about 101 days after the spring freeze cleared.
How long is the growing season in Randolph?
Measured between 28°F hard freezes, Randolph sees about 101 frost-free days — roughly May 31 through Sep 9, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 21 to Aug 26, about 66 days.
Is the soil safe to grow vegetables in Randolph?
The federal record around Randolph is light — 9 documented sites across the 9 federal source types we checked, mostly Underground Storage Tanks entries (6), the nearest Underground Storage Tanks record about 0.2 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 Randolph?
With about 101 frost-free days between hard freezes, Randolph 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 129 to 157 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 31 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Randolph's scale — its 4a band and its 101-day season. Your yard writes its own version of Randolph'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 Randolph’s own scale
6 of the readings below were taken at Randolph's own scale — its own ~101-day season between 28°F freezes, the 822 acres it covers and 9 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Randolph's own USDA hardiness band, zones 4aUSDA PHZM 2023
- Randolph's own 28°F hard-freeze dates, about May 31 and Sep 9 and the ~101-day span between themNOAA 1991–2020 Climate Normals
- 9 documented contamination sites on the federal record near Randolph, the closest Underground Storage Tanks record about 0.2 miles out from the town centreFederal environmental registers
- Randolph's boundary and the 822 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 4a and a ~101-day seasonGrowable Ground crop-matching engine
- The ecoregion at Randolph's own centroid, the Wyoming BasinUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Randolph's 822 acres read through its county's SSURGO summaryfrom Rich County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Rich 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 Rich County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Randolph's 822 acreswhy one lot differs from the next →
- Which side of Randolph you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 822 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Underground Storage Tanks record about 0.2 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 Randolph-wide figureread your own land →
More in Utah
Wider growing context
What grows across UtahRandolph sits outside our named growing regions, so Utah as a whole is its closest context here.
Nearby growing guides