Boulevard, California, sits in USDA hardiness zone 9a — a range where zone-matched perennials and frost-aware annual timing set what succeeds.
Expect artichoke, fig, california poppy, and cabbage to be strong candidates here; the deciding factors on any one parcel stay local — soil, sun, and drainage.
Even in Boulevard, 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 Boulevard 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 Boulevard — soil, climate, flood, and parcel records. How we handle your address.
No card required · your full report in seconds
Boulevard — the short answer
Boulevard, California: USDA zone 9a, about 311 days between hard freezes, across 3K 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
- 3K 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 Boulevard's average, not your lot's — a low corner or a tree line moves it. Against Boulevard's 311-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Boulevard
Each reading below is measured for Boulevard itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
From county recordsBoulevard runs about 311 days between hard freezes (read from San Diego County, the closest normal to Boulevard) — 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
MeasuredBoulevard 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 Boulevard is in
Boulevard sits in the Southern California/Northern Baja Coast — EPA Level III, inside the wider Mediterranean California. That is read at Boulevard's own centroid rather than borrowed from San Diego County.
What Grows in Boulevard
Every plant below cleared Boulevard'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 Boulevard?
Almost never — the real question is what to plant next. 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. In a climate this gentle, “too late” hardly applies — the question becomes which crops prefer the cooler months ahead.
What's on the federal record near Boulevard
Closest first, within ~10 miles of Boulevard. Listing isn't leaking, and distance isn't exposure.
- 017S007E30A001SNitrate · 2000 ft
- MOUNTAIN TOP MARKETUnderground Storage Tanks · 2300 ft
- MOUNTAIN TOP MARKET & GASBrownfields · 2300 ft
- CAL FIRE/ S.D. FIRE AUTHORITY FIRE STATION DBA MERCYBrownfields · 0.6 mi
- AMERICAN LITHUM ENERGY CORPORATIONBrownfields · 0.8 mi
- SAN DIEGO GAS AND ELECTRIC-BOULEVARD SUBSTATIONBrownfields · 1.1 mi
- US CBP BOULEVARD BORDER PATROL STATION #CA11560Toxics Release Inventory · 1.3 mi
- 017S007E15W001SNitrate · 2.2 mi
- MCCAIN VALLEY CONSERVATION CAMPBrownfields · 2.5 mi
- LIVE OAK SPRINGS MARKETUnderground Storage Tanks · 3.1 mi
- SAN DIEGO GAS AND ELECTRIC - SUNRISE TEL. EP215Brownfields · 3.2 mi
- 017S006E13N002SNitrate · 3.2 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Boulevard'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 Boulevard.
Total Sites
73
within ~10 miles of Boulevard
Risk Level
Elevated
Highest-severity
2 Superfund sites (none NPL-listed)
Sources Checked
within ~10 miles of Boulevard
Severity Distribution
within ~10 miles of Boulevard
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Boulevard, two things run higher than the national average within ~10 miles of Boulevard — Nitrate (44 sites) and Mining (5 sites). Knowing it is half the work — and it's nothing a thoughtful grower can't plan for.
Nitrate: Nitrate contamination primarily comes from agricultural fertilizer runoff and failing septic systems.
Mining: Mining sites — both historic and active — can leach heavy metals (arsenic, lead, cadmium, mercury) into soil and water for centuries after operations cease.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Test soil for heavy metals (lead, arsenic, cadmium, mercury) — this is essential near any mining site.
Check your specific parcel in Boulevard
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 Boulevard average
Your land is one point inside Boulevard
Everything above resolves to Boulevard as a whole — one PHZM band, read across 3K 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 Boulevard Average
Boulevard Average
- ●USDA Zones 9a, averaged across Boulevard
- ●One soil character for all of Boulevard
- ●Frost dates read at Boulevard's scale: Feb 3 to Dec 11
YOUR Parcel
- ✓Your exact zone, not Boulevard's 9a
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Boulevard
Pull a site-specific report for your exact address in Boulevard, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Boulevard averages can't show:
We read public map data around Boulevard — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Boulevard average
How we know this about Boulevard
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 Boulevard
When does frost risk typically end in Boulevard?
The last hard freeze (28°F) in Boulevard 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 Boulevard?
The first hard freeze (28°F) in Boulevard 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 Boulevard?
Measured between 28°F hard freezes, Boulevard 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 Boulevard?
The federal record around Boulevard is a meaningful one — 73 documented sites, mostly Nitrate entries (44), 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 Boulevard?
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 Boulevard's scale — its 9a band and its 311-day season. Your yard writes its own version of Boulevard'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 Boulevard’s own scale
5 of the readings below were taken at Boulevard's own scale — the 2,500 acres it covers and 73 documented sites around it; 5 are borrowed from a wider read, named and linked below.
Measured here
- Boulevard's own USDA hardiness band, zones 9aUSDA PHZM 2023
- 73 documented contamination sites on the federal record near Boulevard, the closest Nitrate record about 0.4 miles out from the town centreFederal environmental registers
- Boulevard's boundary and the 2,500 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 9a and a ~311-day seasonGrowable Ground crop-matching engine
- The ecoregion at Boulevard's own centroid, the Southern California/Northern Baja CoastUS EPA Level III Ecoregions
Inherited from a wider read
- The 28°F hard-freeze dates — Boulevard 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 Boulevard's 2,500 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 Boulevard's 2,500 acreswhy one lot differs from the next →
- Which side of Boulevard you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 2,500 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 Boulevard-wide figureread your own land →
More in California
Wider growing context
What grows across CaliforniaBoulevard sits outside our named growing regions, so California as a whole is its closest context here.
Nearby growing guides