Sereno del Mar, California, sits in USDA hardiness zone 10a — room for a real mix of vegetables, fruit, and perennials matched to the local frost calendar.
Among the crops suited to this profile: avocado, meyer lemon, tomato, and artichoke. The site-level story — soil, sun, drainage — decides the rest.
Even in Sereno del Mar, 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 Sereno del Mar 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 Sereno del Mar — soil, climate, flood, and parcel records. How we handle your address.
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Sereno del Mar — the short answer
Sereno del Mar, California: USDA zone 10a, about 323 days between hard freezes, across 472 acres of town.
- USDA zone
- 10a
- USDA PHZM 2023
- Last hard freeze (28°F)
- Jan 23
- Sonoma County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 12
- Sonoma County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~323
- Sonoma County normal — NOAA 1991–2020, nearest to this town
- Town area
- 472 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 Sonoma County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 10a is Sereno del Mar's average, not your lot's — a low corner or a tree line moves it. Against Sereno del Mar's 323-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Sereno del Mar
Each reading below is measured for Sereno del Mar itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsSereno del Mar runs about 323 days between hard freezes (read from Sonoma County, the closest normal to Sereno del Mar) — 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
MeasuredSereno del Mar 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 Sereno del Mar is in
Sereno del Mar sits in the Central California Foothills and Coastal Mountains — EPA Level III, inside the wider Mediterranean California. That is read at Sereno del Mar's own centroid rather than borrowed from Sonoma County.
What Grows in Sereno del Mar
Plants matched to Sereno del Mar's USDA zones 10a, ordered by how much hardiness margin each has here — the ones with room to spare at both ends of this town's band lead. Each links to its full growing profile.
Is it too late to plant in Sereno del Mar?
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 Jan 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Jan 23 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 12 — long-season crops need about 90 days of runway, quick greens only 30. Here the calendar nearly circles: cool-season crops take the winter shift, and the next window is always close.
What's on the federal record near Sereno del Mar
Closest first, within ~10 miles of Sereno del Mar. Listing isn't leaking, and distance isn't exposure.
- CALIFORNIA STATE PARKS SONOMA COAST SBBrownfields · 2.2 mi
- UC DAVIS BODEGA MARINE LABORATORYUnderground Storage Tanks · 2.3 mi
- CALTRANS DISTRICT 4Brownfields · 3.2 mi
- PACIFIC BELLBrownfields · 3.7 mi
- SONOMA CTY REGIONAL PARKS-SPUD PT MARINABrownfields · 3.9 mi
- SONOMA COUNTY WASTE MANAGEMENT AGENCYBrownfields · 3.9 mi
- Spud Point MarinaUnderground Storage Tanks · 3.9 mi
- AT&T MOBILITYBrownfields · 3.9 mi
- BODEGA TOSCO 76Brownfields · 4.1 mi
- The Tides 76Underground Storage Tanks · 4.1 mi
- LUCAS WHARF INCBrownfields · 4.3 mi
- U C DAVIS BODEGA MARINE LABBrownfields · 4.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Sereno del Mar'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 Sereno del Mar.
Total Sites
89
within ~10 miles of Sereno del Mar
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Sereno del Mar
Severity Distribution
within ~10 miles of Sereno del Mar
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Sereno del Mar, two things run higher than the national average within ~10 miles of Sereno del Mar — Mining (15 sites) and Brownfields (53 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.
Brownfields: Brownfield sites are former commercial or industrial properties where legacy soil contamination (heavy metals, PAHs, petroleum compounds) may persist.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check EPA brownfield remediation status — many sites have completed cleanup with institutional controls.
Check your specific parcel in Sereno del Mar
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 Sereno del Mar average
Your land is one point inside Sereno del Mar
Everything above resolves to Sereno del Mar as a whole — one PHZM band, read across 472 acres, with hard-freeze dates borrowed from Sonoma 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 Sereno del Mar Average
Sereno del Mar Average
- ●USDA Zones 10a, averaged across Sereno del Mar
- ●One soil character for all of Sereno del Mar
- ●Frost dates read at Sereno del Mar's scale: Jan 23 to Dec 12
YOUR Parcel
- ✓Your exact zone, not Sereno del Mar's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Sereno del Mar
Pull a site-specific report for your exact address in Sereno del Mar, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Sereno del Mar averages can't show:
We read public map data around Sereno del Mar — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Sereno del Mar average
How we know this about Sereno del Mar
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 Sonoma 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 Sereno del Mar
When does frost risk typically end in Sereno del Mar?
The last hard freeze (28°F) in Sereno del Mar typically lands around Jan 23, 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 13.
When is the first frost in Sereno del Mar?
The first hard freeze (28°F) in Sereno del Mar typically arrives around Dec 12, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 28, so the watching starts about Nov 12 — about 323 days after the spring freeze cleared.
How long is the growing season in Sereno del Mar?
Measured between 28°F hard freezes, Sereno del Mar sees about 323 frost-free days — roughly Jan 23 through Dec 12, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 13 to Nov 28, about 288 days.
Is the soil safe to grow vegetables in Sereno del Mar?
The federal record around Sereno del Mar is a meaningful one — 89 documented sites, mostly Brownfields entries (53), the nearest Brownfields record about 2.2 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 Sereno del Mar?
From about Nov 12 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 12 (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 12. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Sereno del Mar's scale — its 10a band and its 323-day season. Your yard writes its own version of Sereno del Mar'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 Sereno del Mar’s own scale
4 of the readings below were taken at Sereno del Mar's own scale — the 472 acres it covers and 89 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Sereno del Mar's own USDA hardiness band, zones 10aUSDA PHZM 2023
- 89 documented contamination sites on the federal record near Sereno del Mar, the closest Brownfields record about 2.2 miles out from the town centreFederal environmental registers
- Sereno del Mar's boundary and the 472 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Sereno del Mar's own centroid, the Central California Foothills and Coastal MountainsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Sereno del Mar has no normal of its own, so its county's is the closest measured readfrom Sonoma County
- Soil character — no town-scale survey exists, so Sereno del Mar's 472 acres read through its county's SSURGO summaryfrom Sonoma County
- The candidate plant list — California's curated set, filtered to this zone band and re-ordered by how much margin each has herefrom California
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Sonoma 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 Sonoma County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Sereno del Mar's 472 acreswhy one lot differs from the next →
- Which side of Sereno del Mar you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 472 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 2.2 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 Sereno del Mar-wide figureread your own land →
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