Del Mar, California, sits in USDA hardiness zone 10b — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
On paper, avocado, meyer lemon, tomato, and artichoke all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in 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 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 Del Mar — soil, climate, flood, and parcel records. How we handle your address.
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Del Mar — the short answer
Del Mar, California: USDA zone 10b, about 311 days between hard freezes, across 1K acres of city.
- USDA zone
- 10b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Feb 3
- San Diego County normal — NOAA 1991–2020, nearest to this town
- First hard freeze (28°F)
- Dec 11
- San Diego County normal — NOAA 1991–2020, nearest to this town
- Days between freezes
- ~311
- San Diego County normal — NOAA 1991–2020, nearest to this town
- City area
- 1K 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 San Diego County’s — the closest measured record, labelled as such rather than passed off as local.
Hardiness Zone Range
Zone 10b is Del Mar's average, not your lot's — a low corner or a tree line moves it. Against Del Mar's 311-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Del Mar
Each reading below is measured for 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 recordsDel Mar runs about 311 days between hard freezes (read from San Diego County, the closest normal to 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
MeasuredDel Mar sits in USDA hardiness zone 10b.
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 Del Mar is in
Del Mar sits in the Southern California/Northern Baja Coast — EPA Level III, inside the wider Mediterranean California. That is read at Del Mar's own centroid rather than borrowed from San Diego County.
What Grows in Del Mar
Plants matched to Del Mar's USDA zones 10b, 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 Del Mar?
Usually not — gardeners here simply switch what goes in the ground as the season moves. Cool-season crops can go in from around Jan 6; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Feb 3 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Dec 11 — 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.
Documented around Del Mar
Spotted lanternfly documented 14 miles from Del Mar, first recorded 2022. What to watch for.
What's on the federal record near Del Mar
Closest first, within ~10 miles of Del Mar. Listing isn't leaking, and distance isn't exposure.
- DEL MAR BLUE PRINT CO INCBrownfields · 1500 ft
- BANANA REPUBLIC 8479Brownfields · 1900 ft
- SAN DIEGO GAS & ELECTRIC - SOLANA BEACHBrownfields · 2200 ft
- CITY OF DEL MAR PUBLIC WORKSBrownfields · 2500 ft
- SCRIPPS COASTAL MED CTR - DEL MARBrownfields · 2500 ft
- DEL MAR, CITY OFPFAS · 0.5 mi
- MCCALMON CONSTRUCTION GROUPBrownfields · 0.6 mi
- DEL MAR THOROUGHBRED CLUBBrownfields · 0.6 mi
- FOOTE PHOTO COBrownfields · 0.6 mi
- CA ST OF 22ND DISTRICT AGRIC ABrownfields · 0.6 mi
- DEL MAR CAMERABrownfields · 0.7 mi
- DEL MAR ULTRAMARBrownfields · 0.7 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from 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 Del Mar.
Total Sites
3,136
within ~10 miles of Del Mar
Risk Level
Elevated
Highest-severity
10 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Del Mar
Severity Distribution
within ~10 miles of Del Mar
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Del Mar, Brownfields runs higher than the national average — 2,873 sites within ~10 miles of Del Mar. It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around 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 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 Del Mar average
Your land is one point inside Del Mar
Everything above resolves to Del Mar as a whole — one PHZM band, read across 1K acres, with hard-freeze dates borrowed from San Diego 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 Del Mar Average
Del Mar Average
- ●USDA Zones 10b, averaged across Del Mar
- ●One soil character for all of Del Mar
- ●Frost dates read at Del Mar's scale: Feb 3 to Dec 11
YOUR Parcel
- ✓Your exact zone, not Del Mar's 10b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Del Mar
Pull a site-specific report for your exact address in Del Mar, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Del Mar averages can't show:
We read public map data around Del Mar — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Del Mar average
How we know this about Del Mar
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 San Diego 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 Del Mar
When does frost risk typically end in Del Mar?
The last hard freeze (28°F) in Del Mar typically lands around Feb 3, 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 24.
When is the first frost in Del Mar?
The first hard freeze (28°F) in Del Mar typically arrives around Dec 11, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 27, so the watching starts about Nov 11 — about 311 days after the spring freeze cleared.
How long is the growing season in Del Mar?
Measured between 28°F hard freezes, Del Mar sees about 311 frost-free days — roughly Feb 3 through Dec 11, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Feb 24 to Nov 27, about 276 days.
Is the soil safe to grow vegetables in Del Mar?
The federal record around Del Mar is a meaningful one — 3,136 documented sites, mostly Brownfields entries (2,873), the nearest Brownfields record about 0.3 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 Del Mar?
From about Nov 11 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 11 (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 11. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Del Mar's scale — its 10b band and its 311-day season. Your yard writes its own version of 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 Del Mar’s own scale
5 of the readings below were taken at Del Mar's own scale — the 1,099 acres it covers and 3,136 documented sites around it; 6 are borrowed from a wider read, named and linked below.
Measured here
- Del Mar's own USDA hardiness band, zones 10bUSDA PHZM 2023
- 3,136 documented contamination sites on the federal record near Del Mar, the closest Brownfields record about 0.3 miles out from the town centreFederal environmental registers
- Del Mar's boundary and the 1,099 acres inside itUS Census TIGER/Line 2025
- The ecoregion at Del Mar's own centroid, the Southern California/Northern Baja CoastUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Del Marlydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — Del Mar has no normal of its own, so its county's is the closest measured readfrom San Diego County
- Soil character — no town-scale survey exists, so Del Mar's 1,099 acres read through its county's SSURGO summaryfrom San Diego 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 San Diego 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 San Diego County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Del Mar's 1,099 acreswhy one lot differs from the next →
- Which side of 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 1,099 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Brownfields record about 0.3 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 Del Mar-wide figureread your own land →
More in California
Wider growing context
What grows across CaliforniaDel Mar sits outside our named growing regions, so California as a whole is its closest context here.
Nearby growing guides