Twin Lakes, California, sits in USDA hardiness zone 10a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Expect okra, meyer lemon, california poppy, and artichoke to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Twin Lakes, 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 Twin Lakes 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 Twin Lakes — soil, climate, flood, and parcel records. How we handle your address.
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Twin Lakes — the short answer
Twin Lakes, California: USDA zone 10a, about 333 days between hard freezes, across 442 acres of town.
- USDA zone
- 10a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 17
- Santa Cruz County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 16
- Santa Cruz County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~333
- Santa Cruz County normal — NOAA 1991–2020, nearest to this town
- Town area
- 442 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 Santa Cruz County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 10a is Twin Lakes's average, not your lot's — a low corner or a tree line moves it. Against Twin Lakes's 333-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Twin Lakes
Each reading below is measured for Twin Lakes itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsTwin Lakes runs about 333 days between hard freezes (read from Santa Cruz County, the closest normal to Twin Lakes) — 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
MeasuredTwin Lakes sits in USDA hardiness zone 10a.
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 Twin Lakes is in
Twin Lakes sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Twin Lakes's own centroid, and it is not what its county reads: Santa Cruz County is mostly Coast Range. The wider page above you is answering a different question about different ground.
What Grows in Twin Lakes
Every plant below cleared Twin Lakes's own zone 10a and its 333-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Twin Lakes?
For most of the year, no — what changes is which crops still fit the days remaining. Cool-season crops can go in from around Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 17 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 16 — long-season crops need about 90 days of runway, quick greens only 30. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
What's on the federal record near Twin Lakes
Closest first, within ~10 miles of Twin Lakes. Listing isn't leaking, and distance isn't exposure.
- MOORE & SONS OUTBOARD MOTORSBrownfields · 850 ft
- EAST CLIFF DRY CLEANERSBrownfields · 900 ft
- EAST CLIFF FAMILY HEALTH CENTERBrownfields · 1100 ft
- DOLLAR TREE #03689Brownfields · 1100 ft
- PAT DALEBrownfields · 1300 ft
- VILA MARIA DEL MARBrownfields · 1500 ft
- MATT CRWLEYBrownfields · 2200 ft
- PRIDECOBrownfields · 2300 ft
- SANTA CRUZ PORT DISTRICTBrownfields · 0.6 mi
- DALE TRACYBrownfields · 0.6 mi
- SANTA CRUZ PORT DISTRICTUnderground Storage Tanks · 0.6 mi
- COASTAL WATERSHED COUNCILBrownfields · 0.6 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Twin Lakes'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 Twin Lakes.
Sources Checked
within ~10 miles of Twin Lakes
Severity Distribution
within ~10 miles of Twin Lakes
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Twin Lakes, Brownfields runs higher than the national average — 789 sites within ~10 miles of Twin Lakes. 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 Twin Lakes
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 Twin Lakes average
Your land is one point inside Twin Lakes
Everything above resolves to Twin Lakes as a whole — one PHZM band, read across 442 acres, with hard-freeze dates borrowed from Santa Cruz County’s record because no 30-year normal resolves at this town’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 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 Twin Lakes Average
Twin Lakes Average
- ●USDA Zones 10a, averaged across Twin Lakes
- ●One soil character for all of Twin Lakes
- ●Frost dates read at Twin Lakes's scale: Jan 17 to Dec 16
YOUR Parcel
- ✓Your exact zone, not Twin Lakes's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Twin Lakes
Pull a site-specific report for your exact address in Twin Lakes, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Twin Lakes averages can't show:
We read public map data around Twin Lakes — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Twin Lakes average
How we know this about Twin Lakes
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 Santa Cruz 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 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 Twin Lakes
When does frost risk typically end in Twin Lakes?
The last hard freeze (28°F) in Twin Lakes typically lands around Jan 17, 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 Feb 7.
When is the first frost in Twin Lakes?
The first hard freeze (28°F) in Twin Lakes typically arrives around Dec 16, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Dec 2, so the watching starts about Nov 16 — about 333 days after the spring freeze cleared.
How long is the growing season in Twin Lakes?
Measured between 28°F hard freezes, Twin Lakes sees about 333 frost-free days — roughly Jan 17 through Dec 16, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 7 to Dec 2, about 298 days.
Is the soil safe to grow vegetables in Twin Lakes?
The federal record around Twin Lakes is a meaningful one — 939 documented sites, mostly Brownfields entries (789), 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 Twin Lakes?
From about Nov 16 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 16 (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 16. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Twin Lakes's scale — its 10a band and its 333-day season. Your yard writes its own version of Twin Lakes'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 Twin Lakes’s own scale
5 of the readings below were taken at Twin Lakes's own scale — the 442 acres it covers and 939 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Twin Lakes's own USDA hardiness band, zones 10aUSDA PHZM 2023
- 939 documented contamination sites on the federal record near Twin Lakes, the closest Brownfields record about 0.2 miles out from the town centreFederal environmental registers
- Twin Lakes's boundary and the 442 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 10a and a ~333-day seasonGrowable Ground crop-matching engine
- Twin Lakes sits in the Central California Foothills and Coastal Mountains — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Twin Lakes has no normal of its own, so its county's is the closest measured readfrom Santa Cruz County
- Soil character — no town-scale survey exists, so Twin Lakes's 442 acres read through its county's SSURGO summaryfrom Santa Cruz County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Santa Cruz 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 Santa Cruz County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Twin Lakes's 442 acreswhy one lot differs from the next →
- Which side of Twin Lakes you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 442 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 Twin Lakes-wide figureread your own land →