Arcata, California, sits in USDA hardiness zone 9b — enough range to grow cool-season vegetables, hardy fruit, and warm-season crops that mature before the first hard frost.
Reliable performers under these conditions include okra, meyer lemon, california poppy, and artichoke; what your own ground favors still comes down to its soil, sun, and drainage.
Even in Arcata, 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 Arcata 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 Arcata — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Arcata — the short answer
Arcata, California: USDA zone 9b, about 278 days between hard freezes, across 6K acres of city.
- USDA zone
- 9b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 1
- Humboldt County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 4
- Humboldt County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~278
- Humboldt County normal — NOAA 1991–2020, nearest to this town
- City area
- 6K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. No 30-year normal resolves at this town’s own centroid, so the hard-freeze dates are Humboldt County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 9b is Arcata's average, not your lot's — a low corner or a tree line moves it. Against Arcata's 278-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Arcata
Each reading below is measured for Arcata itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsArcata runs about 278 days between hard freezes (read from Humboldt County, the closest normal to Arcata) — close to year-round growing.
Frost is rarely the limit here; winter plantings are as real as summer ones, and the harder question is which crops shrug off the summer heat.
Grow cool-season crops through the mild winter, and choose heat-tolerant varieties for the summer beds.
NOAA 1991–2020 Climate Normals
Winter hardiness
MeasuredArcata sits in USDA hardiness zone 9b.
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 Arcata is in
Arcata sits in the Coast Range — EPA Level III, inside the wider Marine West Coast Forest. That is read at Arcata's own centroid rather than borrowed from Humboldt County.
What Grows in Arcata
Every plant below cleared Arcata's own zone 9b and its 278-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Arcata?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 4 — long-season crops need about 90 days of runway, quick greens only 30. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Arcata
Closest first, within ~10 miles of Arcata. Listing isn't leaking, and distance isn't exposure.
- CALIFORNIA HIGHWAY PATROL #125 HUMBOLTBrownfields · 1000 ft
- GC & BG TUCKER DDSBrownfields · 1200 ft
- ARCATA SCHOOL DISTRICTBrownfields · 0.5 mi
- ALTO BROTHERS TRUCKING INCBrownfields · 0.6 mi
- LONGS DRUG STORE NO 482Brownfields · 0.6 mi
- G AND K ENGINE SVCBrownfields · 0.7 mi
- CITY OF ARCATA CORP YARDBrownfields · 0.7 mi
- BO & T - Uniontown Union GasUnderground Storage Tanks · 0.7 mi
- ARCATA UNIONTOWN 76Brownfields · 0.7 mi
- RECOLOGY ARCATABrownfields · 0.7 mi
- STATEWIDE TRAFFIC SAFETY AND SIGNS INCBrownfields · 0.7 mi
- FIGAS CONSTRUCTIONBrownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Arcata'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 Arcata.
Total Sites
568
within ~10 miles of Arcata
Risk Level
Elevated
Highest-severity
6 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Arcata
Severity Distribution
within ~10 miles of Arcata
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Arcata, Brownfields runs higher than the national average — 481 sites within ~10 miles of Arcata. That's not a problem with your land — it's information about it.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Arcata
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 Arcata average
Your land is one point inside Arcata
Everything above resolves to Arcata as a whole — one PHZM band, read across 6K acres, with hard-freeze dates borrowed from Humboldt County’s record because no 30-year normal resolves at this city’s own centroid. 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 Arcata Average
Arcata Average
- ●USDA Zones 9b, averaged across Arcata
- ●One soil character for all of Arcata
- ●Frost dates read at Arcata's scale: Mar 1 to Dec 4
YOUR Parcel
- ✓Your exact zone, not Arcata's 9b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Arcata
Pull a site-specific report for your exact address in Arcata, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Arcata averages can't show:
We read public map data around Arcata — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Arcata average
How we know this about Arcata
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 Humboldt County’s record, because none resolves here; 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 Arcata
When does frost risk typically end in Arcata?
The last hard freeze (28°F) in Arcata typically lands around Mar 1, 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 Mar 22.
When is the first frost in Arcata?
The first hard freeze (28°F) in Arcata typically arrives around Dec 4, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 20, so the watching starts about Nov 4 — about 278 days after the spring freeze cleared.
How long is the growing season in Arcata?
Measured between 28°F hard freezes, Arcata sees about 278 frost-free days — roughly Mar 1 through Dec 4, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 22 to Nov 20, about 243 days.
Is the soil safe to grow vegetables in Arcata?
The federal record around Arcata is a meaningful one — 568 documented sites, mostly Brownfields entries (481), the nearest Brownfields record about 0.2 miles out — so a soil test before new food beds is a sensible precaution here, not a reason to hold back from growing. Remember that proximity to a documented site is information, not a diagnosis of any one yard; the contamination map shows exactly what sits where.
How do I protect my plants from frost in Arcata?
From about Nov 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 Dec 4 (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 Dec 4. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Arcata's scale — its 9b band and its 278-day season. Your yard writes its own version of Arcata'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 Arcata’s own scale
5 of the readings below were taken at Arcata's own scale — the 6,026 acres it covers and 568 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Arcata's own USDA hardiness band, zones 9bUSDA PHZM 2023
- 568 documented contamination sites on the federal record near Arcata, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Arcata's boundary and the 6,026 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9b and a ~278-day seasonGrowable Ground crop-matching engine
- The ecoregion at Arcata's own centroid, the Coast RangeUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Arcata has no normal of its own, so its county's is the closest measured readfrom Humboldt County
- Soil character — no town-scale survey exists, so Arcata's 6,026 acres read through its county's SSURGO summaryfrom Humboldt County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Humboldt 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 Humboldt County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Arcata's 6,026 acreswhy one lot differs from the next →
- Which side of Arcata you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 6,026 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields 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 Arcata-wide figureread your own land →
More in California
Growing region
Nearby growing guides