Boron, California, sits in USDA hardiness zone 8b — a band that supports both cool-season staples and warm-season crops chosen to fit the local frost window.
A short list that earns its place here — cabbage, fig, california poppy, and collard greens — with any one site's soil, sun, and drainage making the final cut.
Even in Boron, 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 Boron 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 Boron — soil, climate, flood, and parcel records. How we handle your address.
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Boron — the short answer
Boron, California: USDA zone 8b, about 262 days between hard freezes, across 9K acres of town.
- USDA zone
- 8b
- USDA PHZM 2023
- Last hard freeze (28°F)
- Mar 1
- NOAA 1991–2020 Climate Normals, 28°F — this town
- First hard freeze (28°F)
- Nov 18
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Days between freezes
- ~262
- NOAA 1991–2020 Climate Normals, 28°F — this town
- Town area
- 9K acres
- US Census TIGER/Line 2025
Every figure names the dataset it came from. Hard-freeze dates are this town’s own 28°F normals: light frosts run a few weeks past them, and tender transplants usually wait 2–3 weeks after the last hard freeze.
Hardiness Zone Range
Zone 8b is Boron's average, not your lot's — a low corner or a tree line moves it. Against Boron's 262-day season, see what your own ground reads.
Soil varies lot by lot — soil types explained.
What this means for growing in Boron
Each reading below is measured for Boron itself — here is what it means for a garden here, and the move an experienced grower makes about it.
Season length
MeasuredBoron runs about 262 days between hard freezes — 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
MeasuredBoron sits in USDA hardiness zone 8b.
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 Boron is in
Boron sits in the Mojave Basin and Range — EPA Level III, inside the wider North American Deserts. That is read at Boron's own centroid, and it is not what its county reads: Kern County is mostly Central California Valley. The wider page above you is answering a different question about different ground.
What Grows in Boron
Every plant below cleared Boron's own zone 8b and its 262-day season. Each card opens that plant's California profile. How we score.
Is it too late to plant in Boron?
Rarely: the season closes in stages, not all at once, and each stage has its crops. Cool-season crops can go in from around Feb 1; tender transplants wait until two to three weeks after the last 28°F hard freeze, which lands near Mar 1 (NOAA 1991–2020 climate normals); and from midsummer, planting counts back from the first fall freeze around Nov 18 — 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 Boron
Closest first, within ~10 miles of Boron. Listing isn't leaking, and distance isn't exposure.
- 011N007W30G001SNitrate · 0.6 mi
- CURTIS PETREYBrownfields · 0.7 mi
- 011N008W26J001SNitrate · 1.2 mi
- MUROC JT UNIF SCHL DIST TRANSPORTBrownfields · 1.2 mi
- 011N007W31P002SNitrate · 1.3 mi
- BORON AUTO BODYBrownfields · 1.3 mi
- 011N007W32M002SNitrate · 1.4 mi
- CIRCLE K STORE #749Brownfields · 1.4 mi
- Boron ShellUnderground Storage Tanks · 1.4 mi
- ROSS E SWINDELHURST DMDBrownfields · 1.5 mi
- FAMILY DOLLAR #31432Brownfields · 1.5 mi
- LOVE'S TRAVEL STOPS #755Brownfields · 1.5 mi
6 more sites are on the record inside the same radius. See them on the map
Measured from Boron'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 Boron.
Total Sites
184
within ~10 miles of Boron
Risk Level
Moderate
Highest-severity
1 Toxics Release Inventory facility
Sources Checked
within ~10 miles of Boron
Severity Distribution
within ~10 miles of Boron
Highest-Severity Sites
A note from Gnorman
What an experienced grower watches for around here
In and around Boron, Nitrate runs higher than the national average — 148 sites within ~10 miles of Boron. 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.
Test well water for nitrate if you rely on a private well for irrigation (EPA standard: 10 mg/L).
Check your specific parcel in Boron
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 Boron average
Your land is one point inside Boron
Everything above resolves to Boron as a whole — one PHZM band and one 28°F frost record, read across 9K acres. 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 Boron Average
Boron Average
- ●USDA Zones 8b, averaged across Boron
- ●One soil character for all of Boron
- ●Frost dates read at Boron's scale: Mar 1 to Nov 18
YOUR Parcel
- ✓Your exact zone, not Boron's 8b
- ✓Your SSURGO soil type & pH
- ✓Your sun exposure, cast in 3D
See MY Growing Report
Read your specific parcel in Boron
Pull a site-specific report for your exact address in Boron, California — soil, sun, drainage, frost risk, and scored plant recommendations.
Three things about your lot that Boron averages can't show:
We read public map data around Boron — soil, climate, flood, and parcel records. How we handle your address.
25+ data sources read at your address, not the Boron average
How we know this about Boron
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 Boron’s own record; 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 Boron
When does frost risk typically end in Boron?
The last hard freeze (28°F) in Boron typically lands around Mar 1, 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 Mar 22.
When is the first frost in Boron?
The first hard freeze (28°F) in Boron typically arrives around Nov 18, per NOAA 1991–2020 climate normals — the point tender summer crops finish. Lighter frosts run ahead of it, near Nov 4, so the watching starts about Oct 19 — about 262 days after the spring freeze cleared.
How long is the growing season in Boron?
Measured between 28°F hard freezes, Boron sees about 262 frost-free days — roughly Mar 1 through Nov 18, per NOAA 1991–2020 climate normals. Tender crops work a shorter one: nearer Mar 22 to Nov 4, about 227 days.
Is the soil safe to grow vegetables in Boron?
The federal record around Boron shows 184 documented sites, mostly Nitrate entries (148), the nearest Nitrate record about 0.6 miles out — a typical footprint for a growing area, and proximity to a documented site is information, not a diagnosis of any one yard. It's worth seeing which recorded sites sit closest to where you grow, and testing the soil before new food beds near any of them.
How do I protect my plants from frost in Boron?
From about Oct 19 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 Nov 18 (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 Nov 18. Hardy greens and roots shrug off light frost and sweeten after it — leave them in.
Everything above is measured at Boron's scale — its 8b band and its 262-day season. Your yard writes its own version of Boron'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 Boron’s own scale
6 of the readings below were taken at Boron's own scale — its own ~262-day season between 28°F freezes, the 8,776 acres it covers and 184 documented sites around it; 4 are borrowed from a wider read, named and linked below.
Measured here
- Boron's own USDA hardiness band, zones 8bUSDA PHZM 2023
- Boron's own 28°F hard-freeze dates, about Mar 1 and Nov 18 and the ~262-day span between themNOAA 1991–2020 Climate Normals
- 184 documented contamination sites on the federal record near Boron, the closest Nitrate record about 0.6 miles out from the town centreFederal environmental registers
- Boron's boundary and the 8,776 acres inside itUS Census TIGER/Line 2025
- Which of 1,086 plants clear zones 8b and a ~262-day seasonGrowable Ground crop-matching engine
- Boron sits in the Mojave Basin and Range — not the ecoregion its county mostly readsUS EPA Level III Ecoregions
Inherited from a wider read
- Soil character — no town-scale survey exists, so Boron's 8,776 acres read through its county's SSURGO summaryfrom Kern County
- Growing-degree days and winter chill — measured county-wide only, so the county page carries themfrom Kern 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 Kern County
What this page can’t tell you
- The soil pH, drainage, sun hours, and frost pockets on any one lot among Boron's 8,776 acreswhy one lot differs from the next →
- Which side of Boron you're on — a low spot frosts first and a south wall warms early, and one normal is being asked to speak for all 8,776 acresreading your own microclimate →
- How close that record sits to YOUR lot — the closest Nitrate record about 0.6 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 Boron-wide figureread your own land →