Jacumba, California, sits in USDA hardiness zone 9a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
On paper, artichoke, fig, california poppy, and cabbage all suit these conditions — on the ground, soil, sun, and drainage make the final call.
Even in Jacumba, 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 Jacumba 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 Jacumba — soil, climate, flood, and parcel records. How we handle your address.
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Jacumba — the short answer
Jacumba, California: USDA zone 9a, about 311 days between hard freezes, across 4K acres of town.
- USDA zone
- 9a
- 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
- 4K 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 9a is Jacumba's average, not your lot's — a low corner or a tree line moves it. Against Jacumba's 311-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Jacumba
Each reading below is measured for Jacumba itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsJacumba runs about 311 days between hard freezes (read from San Diego County, the closest normal to Jacumba) — 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
MeasuredJacumba sits in USDA hardiness zone 9a.
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 Jacumba is in
Jacumba sits in the Sonoran Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Jacumba's own centroid, and it is not what its county reads: San Diego County is mostly Southern California/Northern Baja Coast. The wider page above you is answering a different question about different ground.
What Grows in Jacumba
Every plant below cleared Jacumba's own zone 9a and its 311-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Jacumba?
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 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.
What's on the federal record near Jacumba
Closest first, within ~10 miles of Jacumba. Listing isn't leaking, and distance isn't exposure.
- 018S008E07J001SNitrate · 1.4 mi
- JACUMBA SHELLUnderground Storage Tanks · 1.4 mi
- SHELLBrownfields · 1.5 mi
- JACUMBA CHEVRONUnderground Storage Tanks · 1.5 mi
- WEST COAST BRIDGE INCBrownfields · 2.1 mi
- ALL WAYS METAL RECYCLINGBrownfields · 2.4 mi
- UnnamedMining · 3.6 mi
- SAN DIEGO GAS AND ELECTRIC-BOULEVARD SUBSTATIONBrownfields · 5.0 mi
- Southern Star ClaimMining · 5.1 mi
- 017S007E15W001SNitrate · 5.1 mi
- Southern StarMining · 5.1 mi
- Southern Star GroupsMining · 5.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Jacumba'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 Jacumba.
Total Sites
44
within ~10 miles of Jacumba
Risk Level
Low
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Jacumba
Severity Distribution
within ~10 miles of Jacumba
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Jacumba, two things run higher than the national average within ~10 miles of Jacumba — Mining (6 sites) and Nitrate (20 sites). It's not cause for alarm — it's worth knowing, and there's a sensible way to grow around it.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Jacumba
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 Jacumba average
Your land is one point inside Jacumba
Everything above resolves to Jacumba as a whole — one PHZM band, read across 4K 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 Jacumba Average
Jacumba Average
- ●USDA Zones 9a, averaged across Jacumba
- ●One soil character for all of Jacumba
- ●Frost dates read at Jacumba's scale: Feb 3 to Dec 11
YOUR Parcel
- ✓Your exact zone, not Jacumba's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Jacumba
Pull a site-specific report for your exact address in Jacumba, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Jacumba averages can't show:
We read public map data around Jacumba — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Jacumba average
How we know this about Jacumba
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 Jacumba
When does frost risk typically end in Jacumba?
The last hard freeze (28°F) in Jacumba 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 Jacumba?
The first hard freeze (28°F) in Jacumba 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 Jacumba?
Measured between 28°F hard freezes, Jacumba 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 Jacumba?
The federal record around Jacumba is light — 44 documented sites across the 9 federal source types we checked, mostly Nitrate entries (20), the nearest Nitrate record about 1.4 miles out — and proximity to a documented site is information, not a diagnosis of any one yard. Growing food here starts from a strong position; a soil test before new food beds settles any site-specific question.
How do I protect my plants from frost in Jacumba?
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 Jacumba's scale — its 9a band and its 311-day season. Your yard writes its own version of Jacumba'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 Jacumba’s own scale
5 of the readings below were taken at Jacumba's own scale — the 3,918 acres it covers and 44 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Jacumba's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 44 documented contamination sites on the federal record near Jacumba, the closest Nitrate record about 1.4 miles out from the town centreFederal environmental registers
- Jacumba's boundary and the 3,918 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~311-day seasonGrowable Ground crop-matching engine
- Jacumba sits in the Sonoran Basin and Range — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Jacumba 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 Jacumba's 3,918 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 Jacumba's 3,918 acreswhy one lot differs from the next →
- Which side of Jacumba you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 3,918 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 1.4 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 Jacumba-wide figureread your own land →
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