Etna, 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.
Well-matched crops include cabbage, fig, california poppy, and collard greens, and the gap between "grows in the area" and "grows in your yard" is closed by soil, sun, and drainage.
Even in Etna, 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 Etna 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 Etna — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Etna — the short answer
Etna, California: USDA zone 8a, about 198 days between hard freezes, across 490 acres of city.
- USDA zone
- 8a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Apr 19
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 3
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~198
- NOAA 1991–2020 Climate Normals, 28°F — this town
- City area
- 490 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 Etna's average, not your lot's — a low corner or a tree line moves it. Against Etna's 198-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Etna
Each reading below is measured for Etna itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredEtna runs about 198 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
MeasuredEtna 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 Etna is in
Etna sits in the Klamath Mountains/California High North Coast Range — EPA Level III, inside the wider Northwestern Forested Mountains. That is read at Etna's own centroid rather than borrowed from Siskiyou County.
What Grows in Etna
Every plant below cleared Etna's own zone 8a and its 198-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Etna?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Mar 22; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Apr 19 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 3 — long-season crops need about 90 days of runway, quick greens only 30. As the window narrows, the plantings just get faster — fall brassicas, then greens, then garlic to finish.
What's on the federal record near Etna
Closest first, within ~10 miles of Etna. Listing isn't leaking, and distance isn't exposure.
- ETNA CITY SHOPBrownfields · 800 ft
- SISKIYOU COUNTYBrownfields · 1100 ft
- ETNA HIGH SCHOOLBrownfields · 1200 ft
- DOLLAR GENERAL #16154Brownfields · 1900 ft
- MOUNTAIN VILLIAGE PARKBrownfields · 2300 ft
- Mountain Village Park, Inc.Underground Storage Tanks · 2300 ft
- Meidell and FarrelMining · 1.0 mi
- SISKIYOU COUNTY ROAD DEPT DISTRICT 5Brownfields · 1.4 mi
- CAL TRANS ETNA MAINT STNBrownfields · 1.5 mi
- BallMining · 2.7 mi
- GrantMining · 2.7 mi
- Masterson and McbrideMining · 3.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Etna'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 Etna.
Sources Checked
within ~10 miles of Etna
Severity Distribution
within ~10 miles of Etna
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Etna, Mining runs higher than the national average — 34 sites within ~10 miles of Etna. 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 Etna
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 Etna average
Your land is one point inside Etna
Everything above resolves to Etna as a whole — one PHZM band and one 28°F frost record, read across 490 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 Etna Average
Etna Average
- ●USDA Zones 8a, averaged across Etna
- ●One soil character for all of Etna
- ●Frost dates read at Etna's scale: Apr 19 to Nov 3
YOUR Parcel
- ✓Your exact zone, not Etna's 8a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Etna
Pull a site-specific report for your exact address in Etna, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Etna averages can't show:
We read public map data around Etna — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Etna average
How we know this about Etna
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 Etna’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 Etna
When does frost risk typically end in Etna?
The last hard freeze (28°F) in Etna typically lands around Apr 19, 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 10.
When is the first frost in Etna?
The first hard freeze (28°F) in Etna typically arrives around Nov 3, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Oct 20, so the watching starts about Oct 4 — about 198 days after the spring freeze cleared.
How long is the growing season in Etna?
Measured between 28°F hard freezes, Etna sees about 198 frost-free days — roughly Apr 19 through Nov 3, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer May 10 to Oct 20, about 163 days.
Is the soil safe to grow vegetables in Etna?
The federal record around Etna shows 55 documented sites, mostly Mining entries (34), the nearest Brownfields record about 0.1 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Etna?
From about Oct 4 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 Nov 3 (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 Nov 3. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Etna's scale — its 8a band and its 198-day season. Your yard writes its own version of Etna'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 Etna’s own scale
6 of the readings below were taken at Etna's own scale — its own ~198-day season between 28°F freezes, the 490 acres it covers and 55 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Etna's own USDA hardiness band, zones 8aUSDA PHZM 2023
- Etna's own 28°F hard-freeze dates, about Apr 19 and Nov 3 and the ~198-day span between themNOAA 1991–2020 Climate Normals
- 55 documented contamination sites on the federal record near Etna, the closest Brownfields record about 0.1 miles out from the town centreFederal environmental registers
- Etna's boundary and the 490 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8a and a ~198-day seasonGrowable Ground crop-matching engine
- The ecoregion at Etna's own centroid, the Klamath Mountains/California High North Coast RangeUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Etna's 490 acres read through its county's SSURGO summaryfrom Siskiyou County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Siskiyou 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 Siskiyou County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Etna's 490 acreswhy one lot differs from the next →
- Which side of Etna you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 490 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.1 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 Etna-wide figureread your own land →
More in California
Growing region
Nearby growing guides