Silver Summit, Utah, sits in USDA hardiness zone 5b — a zone band wide enough that plant choice, not possibility, is the interesting question.
Expect cabbage, cranberry, lavender, and collard greens to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Silver Summit, 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 Silver Summit 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 Silver Summit — soil, climate, flood, and parcel records. How we handle your address.
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Silver Summit — the short answer
Silver Summit, Utah: USDA zone 5b, about 130 days between hard freezes, across 7K acres of town.
- USDA zone
- 5b
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 20
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Sep 27
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~130
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 7K 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 Silver Summit's average, not your lot's — a low corner or a tree line moves it. Against Silver Summit's 130-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Silver Summit
Each reading below is measured for Silver Summit itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSilver Summit runs about 130 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
MeasuredSilver Summit 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 Silver Summit is in
Silver Summit sits in the Wasatch and Uinta Mountains — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Silver Summit's own centroid rather than borrowed from Summit County.
What Grows in Silver Summit
Every plant below cleared Silver Summit's own zone 5b and its 130-day season. Each card opens that plant's Utah profile. How we score.
Is it too late to plant in Silver Summit?
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 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 20 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Sep 27 — long-season crops need about 90 days of runway, quick greens only 30. Even here the calendar’s edges hold value: thirty-day greens late in the window, then garlic and a rested bed for spring.
Documented around Silver Summit
Spotted lanternfly documented 18 miles from Silver Summit, first recorded 2020. What to watch for.
What's on the federal record near Silver Summit
Closest first, within ~10 miles of Silver Summit. Listing isn't leaking, and distance isn't exposure.
- GORGOZA MUTUAL WATER COPFAS · 1.0 mi
- MOUNTAIN REGIONAL WATER SSDPFAS · 1.0 mi
- SUMMIT WATER DISTRIBUTION COMPANYPFAS · 1.0 mi
- (D- 1- 4)17bbb- 1Nitrate · 1.0 mi
- SILVER CREEK JCT. SINCLAIRUnderground Storage Tanks · 1.3 mi
- (D- 1- 4)16dca- 1Nitrate · 1.6 mi
- MRWCCS's Well 1 Effluent to East Canyon CreekNitrate · 1.9 mi
- SILVER CREEK WATER RECLAMATION FACILITYUnderground Storage Tanks · 2.1 mi
- CHEVRON PIPE LINE KIMBALL JUNCTION STATIBrownfields · 2.2 mi
- W. MEEKS WIRTHLINUnderground Storage Tanks · 2.2 mi
- EXTRA MART CHEVRON #95Underground Storage Tanks · 2.3 mi
- TRAVEL CLEAN CAR WASHUnderground Storage Tanks · 2.3 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Silver Summit'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 Silver Summit.
Sources Checked
within ~10 miles of Silver Summit
Severity Distribution
within ~10 miles of Silver Summit
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Silver Summit, two things run higher than the national average within ~10 miles of Silver Summit — Mining (178 sites) and Superfund (9 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Silver Summit
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 Silver Summit average
Your land is one point inside Silver Summit
Everything above resolves to Silver Summit as a whole — one PHZM band and one 28°F frost record, read across 7K 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 Silver Summit Average
Silver Summit Average
- ●USDA Zones 5b, averaged across Silver Summit
- ●One soil character for all of Silver Summit
- ●Frost dates read at Silver Summit's scale: May 20 to Sep 27
YOUR Parcel
- ✓Your exact zone, not Silver Summit's 5b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Silver Summit
Pull a site-specific report for your exact address in Silver Summit, Utah — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Silver Summit averages can't show:
We read public map data around Silver Summit — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Silver Summit average
How we know this about Silver Summit
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 Silver Summit’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 Silver Summit
When does frost risk typically end in Silver Summit?
The last hard freeze (28°F) in Silver Summit typically lands around May 20, 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 10.
When is the first frost in Silver Summit?
The first hard freeze (28°F) in Silver Summit typically arrives around Sep 27, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Sep 13, so the watching starts about Aug 28 — about 130 days after the spring freeze cleared.
How long is the growing season in Silver Summit?
Measured between 28°F hard freezes, Silver Summit sees about 130 frost-free days — roughly May 20 through Sep 27, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Jun 10 to Sep 13, about 95 days.
Is the soil safe to grow vegetables in Silver Summit?
The federal record around Silver Summit runs heavier than most — 310 documented sites, mostly Mining entries (178), the nearest PFAS record about 1.0 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 gardeners stretch the season in Silver Summit?
With about 130 frost-free days between hard freezes, Silver Summit 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 158 to 186 days — and cold frames or low tunnels buy more. Starting transplants indoors ahead of the May 20 hard-freeze normal stretches the season without touching the calendar.
Everything above is measured at Silver Summit's scale — its 5b band and its 130-day season. Your yard writes its own version of Silver Summit'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 Silver Summit’s own scale
7 of the readings below were taken at Silver Summit's own scale — its own ~130-day season between 28°F freezes, the 7,192 acres it covers and 310 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Silver Summit's own USDA hardiness band, zones 5bUSDA PHZM 2023
- Silver Summit's own 28°F hard-freeze dates, about May 20 and Sep 27 and the ~130-day span between themNOAA 1991–2020 Climate Normals
- 310 documented contamination sites on the federal record near Silver Summit, the closest PFAS record about 1.0 miles out from the town centreFederal environmental registers
- Silver Summit's boundary and the 7,192 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 5b and a ~130-day seasonGrowable Ground crop-matching engine
- The ecoregion at Silver Summit's own centroid, the Wasatch and Uinta MountainsUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Silver Summitlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- Soil character — no town-scale survey exists, so Silver Summit's 7,192 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 Silver Summit's 7,192 acreswhy one lot differs from the next →
- Which side of Silver Summit you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 7,192 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest PFAS record about 1.0 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 Silver Summit-wide figureread your own land →