Del Dios, California, sits in USDA hardiness zone 10a — a zone band wide enough that plant choice, not possibility, is the interesting question.
Crops well matched to these conditions include okra, meyer lemon, california poppy, and artichoke — though what thrives on any one site still turns on its specific soil, sun, and drainage.
Even in Del Dios, 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 Dios 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 Dios — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Del Dios — the short answer
Del Dios, California: USDA zone 10a, about 311 days between hard freezes, across 262 acres of town.
- USDA zone
- 10a
- 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
- Town area
- 262 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 10a is Del Dios's average, not your lot's — a low corner or a tree line moves it. Against Del Dios'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 Dios
Each reading below is measured for Del Dios itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsDel Dios runs about 311 days between hard freezes (read from San Diego County, the closest normal to Del Dios) — 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 Dios 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 Del Dios is in
Del Dios sits in the Southern California/Northern Baja Coast — EPA Level III, inside the wider Mediterranean California. That is read at Del Dios's own centroid rather than borrowed from San Diego County.
What Grows in Del Dios
Every plant below cleared Del Dios's own zone 10a and its 311-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Del Dios?
Rarely: the season closes in stages, not all at once, and each stage has its crops. 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. With almost year-round growing weather, timing is about heat and rainfall more than frost — some bench is always in play.
Documented around Del Dios
Spotted lanternfly documented 6 miles from Del Dios, first recorded 2022. What to watch for.
What's on the federal record near Del Dios
Closest first, within ~10 miles of Del Dios. Listing isn't leaking, and distance isn't exposure.
- 013S002W05D001SNitrate · 2000 ft
- SELF MADE PERFORMANCE LLCBrownfields · 0.6 mi
- ESCONDIDO, CITY OFPFAS · 0.7 mi
- RINCON DEL DIABLO MWD (ID-1)PFAS · 0.7 mi
- THE ESCONDIDO VIEWS HOABrownfields · 1.6 mi
- CONTINENTAL HYDRAULICS INCBrownfields · 1.7 mi
- VERITIV OPERATING COMPANY - ESCONDIDO (CA520)Brownfields · 1.7 mi
- DEL LAGO ACADEMY (ESCONDIDO UNION HIGH SCHOOL DISTRICT)Brownfields · 1.8 mi
- SDCTY - PUD, CITRACADO FORCEMAINBrownfields · 1.9 mi
- LAKE HODGES HYDROBrownfields · 1.9 mi
- PROTRANS USA LLCBrownfields · 1.9 mi
- CHATHAM COBrownfields · 2.0 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Del Dios'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 Dios.
Total Sites
3,240
within ~10 miles of Del Dios
Risk Level
Elevated
Highest-severity
4 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Del Dios
Severity Distribution
within ~10 miles of Del Dios
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Del Dios, Brownfields runs higher than the national average — 2,895 sites within ~10 miles of Del Dios. Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
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 Dios
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 Dios average
Your land is one point inside Del Dios
Everything above resolves to Del Dios as a whole — one PHZM band, read across 262 acres, with hard-freeze dates borrowed from San Diego 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 Del Dios Average
Del Dios Average
- ●USDA Zones 10a, averaged across Del Dios
- ●One soil character for all of Del Dios
- ●Frost dates read at Del Dios's scale: Feb 3 to Dec 11
YOUR Parcel
- ✓Your exact zone, not Del Dios's 10a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Del Dios
Pull a site-specific report for your exact address in Del Dios, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Del Dios averages can't show:
We read public map data around Del Dios — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Del Dios average
How we know this about Del Dios
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 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 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 Del Dios
When does frost risk typically end in Del Dios?
The last hard freeze (28°F) in Del Dios 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 Dios?
The first hard freeze (28°F) in Del Dios 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 Dios?
Measured between 28°F hard freezes, Del Dios 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 Dios?
The federal record around Del Dios is a meaningful one — 3,240 documented sites, mostly Brownfields entries (2,895), the nearest Nitrate record about 0.4 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 Dios?
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 Dios's scale — its 10a band and its 311-day season. Your yard writes its own version of Del Dios'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 Dios’s own scale
6 of the readings below were taken at Del Dios's own scale — the 262 acres it covers and 3,240 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Del Dios's own USDA hardiness band, zones 10aUSDA PHZM 2023
- 3,240 documented contamination sites on the federal record near Del Dios, the closest Nitrate record about 0.4 miles out from the town centreFederal environmental registers
- Del Dios's boundary and the 262 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 10a and a ~311-day seasonGrowable Ground crop-matching engine
- The ecoregion at Del Dios's own centroid, the Southern California/Northern Baja CoastUS EPA Level III Ecoregions
- A documented spotted-lanternfly record within reach of Del Dioslydemapr (De Bona & Helmus), 10 km survey lattice
Inherited from a wider read
- The 28°F hard-freeze dates — Del Dios 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 Dios's 262 acres read through its county's SSURGO summaryfrom San Diego County
- 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 Dios's 262 acreswhy one lot differs from the next →
- Which side of Del Dios you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 262 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.4 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 Dios-wide figureread your own land →
More in California
Wider growing context
What grows across CaliforniaDel Dios sits outside our named growing regions, so California as a whole is its closest context here.
Nearby growing guides