Sierra City, California, sits in USDA hardiness zone 8a — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Growers here do well with cabbage, fig, california poppy, and collard greens — with the usual caveat that any single yard's soil, sun, and drainage cast the deciding vote.
Even in Sierra City, 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 Sierra City 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 Sierra City — soil, climate, flood, and parcel records. How we handle your address.
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Sierra City — the short answer
Sierra City, California: USDA zone 8a, about 175 days between hard freezes, across 1K acres of town.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- May 7
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Oct 29
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~175
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 1K 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 8a is Sierra City's average, not your lot's — a low corner or a tree line moves it. Against Sierra City's 175-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sierra City
Each reading below is measured for Sierra City itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredSierra City runs about 175 days between hard freezes — a moderate growing season.
There is room for the full run of cool-season crops plus a warm-season main crop, but the calendar is tight enough that a late spring or early fall frost still decides how much finishes.
Time warm-season transplants to your last hard freeze, and a few weeks of season extension turns a near-miss harvest into a sure one.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredSierra City sits in USDA hardiness zone 8a.
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 Sierra City is in
Sierra City sits in the Sierra Nevada — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Sierra City's own centroid rather than borrowed from Sierra County.
What Grows in Sierra City
Every plant below cleared Sierra City's own zone 8a and its 175-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Sierra City?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Apr 9; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near May 7 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Oct 29 — long-season crops need about 90 days of runway, quick greens only 30. The tail of the season still works: sixty-day crops into late summer, quick greens after, garlic last of all.
What's on the federal record near Sierra City
Closest first, within ~10 miles of Sierra City. Listing isn't leaking, and distance isn't exposure.
- PhoenixMining · 0.5 mi
- Sierra City StationUnderground Storage Tanks · 0.6 mi
- PACIFIC BELL TELEPHONE COMPANYBrownfields · 0.6 mi
- Sierra ButtesMining · 0.9 mi
- EIF HAYPRESS LLCBrownfields · 0.9 mi
- Shamrock GroupMining · 1.0 mi
- Redmayne and McgonigalMining · 1.6 mi
- Milton Chrome ClaimMining · 2.2 mi
- OccurrenceMining · 2.4 mi
- ZuverMining · 2.6 mi
- Colombo-Bullion GroupMining · 2.6 mi
- Milton ClaimMining · 3.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sierra City'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 Sierra City.
Sources Checked
within ~10 miles of Sierra City
Severity Distribution
within ~10 miles of Sierra City
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sierra City, Mining runs higher than the national average — 39 sites within ~10 miles of Sierra City. 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.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Sierra City
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 Sierra City average
Your land is one point inside Sierra City
Everything above resolves to Sierra City as a whole — one PHZM band and one 28°F frost record, read across 1K 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 Sierra City Average
Sierra City Average
- ●USDA Zones 8a, averaged across Sierra City
- ●One soil character for all of Sierra City
- ●Frost dates read at Sierra City's scale: May 7 to Oct 29
YOUR Parcel
- ✓Your exact zone, not Sierra City's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sierra City
Pull a site-specific report for your exact address in Sierra City, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sierra City averages can't show:
We read public map data around Sierra City — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sierra City average
How we know this about Sierra City
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 Sierra City’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 Sierra City
When does frost risk typically end in Sierra City?
The last hard freeze (28°F) in Sierra City typically lands around May 7, 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 May 28.
When is the first frost in Sierra City?
The first hard freeze (28°F) in Sierra City typically arrives around Oct 29, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 15, so the watching starts about Sep 29 — about 175 days after the spring freeze cleared.
How long is the growing season in Sierra City?
Measured between 28°F hard freezes, Sierra City sees about 175 frost-free days — roughly May 7 through Oct 29, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 28 to Oct 15, about 140 days.
Is the soil safe to grow vegetables in Sierra City?
The federal record around Sierra City runs heavier than most — 47 documented sites, mostly Mining entries (39), the nearest Mining record about 0.5 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 Sierra City?
From about Sep 29 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 29 (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 29. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sierra City's scale — its 8a band and its 175-day season. Your yard writes its own version of Sierra City'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 Sierra City’s own scale
6 of the readings below were taken at Sierra City's own scale — its own ~175-day season between 28°F freezes, the 1,377 acres it covers and 47 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Sierra City's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Sierra City's own 28°F hard-freeze dates, about May 7 and Oct 29 and the ~175-day span between themNOAA 1991–2020 Climate Normals
- 47 documented contamination sites on the federal record near Sierra City, the closest Mining record about 0.5 miles out from the town centreFederal environmental registers
- Sierra City's boundary and the 1,377 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~175-day seasonGrowable Ground crop-matching engine
- The ecoregion at Sierra City's own centroid, the Sierra NevadaUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Sierra City's 1,377 acres read through its county's SSURGO summaryfrom Sierra County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Sierra County
- The growing challenges every California grower plans around — written at state scale, so they stay on the state guidefrom California
- Butterfly and beetle records, and the farmland pesticide estimate — all published county-widefrom Sierra County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sierra City's 1,377 acreswhy one lot differs from the next →
- Which side of Sierra City you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 1,377 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Mining record about 0.5 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 Sierra City-wide figureread your own land →
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