Generally — Most Areas
turnip cover crop (zones 2-10) suits most of California (4b-11a) — zones 4-10 are in range, and the rest of the state is the exception.
Your yard isn't the whole zone.
Turnip Cover Crop is grown as an annual, so your winter zone isn't the deciding factor — your frost-free window is. A typical California site runs ~317 frost-free days, but that is a state median, not your yard: slope, trees, and low spots move the last-frost date across a single parcel. Enter your address and we'll score turnip cover crop against your land's actual frost dates, sun, and soil.
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Zone Comparison
Turnip Cover Crop Needs
- USDA Zones: 2-10
- Frost-Free Days: 40+
- Sun: Full Sun
- Picking window: ~30 days of harvest
- Drought tolerance: Low
California Has
- USDA Zones: 4b-11a
- Last Hard Freeze (28°F): Jan 19 - Mar 19
- First Hard Freeze (28°F): Nov 29 - Dec 12
- Annual Rainfall: 5-80 inches
- Common Soils: Alluvial clay, Sandy loam, Adobe clay
Plant Zone Range (zones 2-10)
Preferred Soil pH
Plant data: USDA PLANTS Database / Growable Ground plant catalog. State data: USDA ARS PHZM 2023, NOAA Climate Normals, NRCS SSURGO.
When to Plant Turnip Cover Crop in California
The frost window
Across California, the last spring hard freeze (28°F) clears between Jan 19 and Mar 19, and the first fall hard freeze lands between Nov 29 and Dec 12 (NOAA Regional Climate Centers ACIS, 1991-2020). Counting from the latest last freeze to the earliest first freeze, that's a 255-day window you can count on — up to 327 days on a mild site in a kind year. That marks the hard freeze, not the last light frost, so tender transplants usually wait another 2-3 weeks.
Frost tenderness
Turnip Cover Crop is frost-tender — its listed minimum temperature is 50°F (USDA PLANTS Database) — so set plants out two to three weeks PAST your local last hard freeze, not on it and not on the state's earliest date. The 28°F marker above is when killing freezes stop, not when light frost does.
When to start the seed
Turnip Cover Crop is direct-sown where it grows rather than started under cover, so there is no seed-tray head start to bank — California's dates above are the whole calendar for it. That makes the last-freeze date the binding constraint, and a warmer pocket of your own yard is worth more to this crop than it is to a transplanted one.
Days to maturity vs. the window
At 60 days to maturity (USDA PLANTS Database), counting from the last hard freeze it ripens with 195 days to spare even in California's tightest freeze scenario — room for a later start or a second sowing.
Frost window: NOAA Climate Normals 1991-2020. Plant timing fields: USDA PLANTS Database. Your site's own frost dates can run earlier or later than the state range — a parcel report pins them down.
Growing Season Fit
The zone check says turnip cover crop survives winter in part of California, not across all of it. Whether the season is long enough — and warm enough — is a different question.
Frost-free days
Turnip Cover Crop wants 40+ frost-free days; a typical California site sees ~317 (NOAA Regional Climate Centers ACIS, 1991-2020). That leaves comfortable headroom for succession planting.
Growing degree days
Turnip Cover Crop needs ~1100 GDD (base 50°F) to ripen. The state median runs ~4290 GDD (from PRISM 1991-2020 climate normals), so California's typical season clears that easily.
GDD and chill-hour figures are computed from PRISM 1991-2020 monthly climate normals; frost-free days from NOAA Regional Climate Centers ACIS, 1991-2020. Each is the state median across its counties (P25/P75 span the within-state spread). Hardiness-zone range is USDA PHZM 2023.
Soil + Drainage Fit
Turnip Cover Crop likes near-neutral soil (pH 5-7). That's the common-ground band across California's alluvial clay and sandy loam — a soil test confirms it for your site. It will grow across that whole span, but it does best between pH 5.5 and 6.5 — worth knowing before you decide whether a California soil test result is a problem or just a number. Drainage matters: this plant wants well (dry spells). If your California site is heavier clay or sits in a low spot, raised beds or amendment with compost solve it.
Plant pH and drainage requirements from USDA PLANTS Database. California soil profile from USDA NRCS SSURGO. Site-specific verification: a 30-minute soil test from your local Extension lab.
Turnip Cover Crop in California — Quick Answer
- Verdict: Generally — Most Areas
- Plant Zones: 2-10 (USDA PLANTS Database)
- State Zones: 4b-11a (USDA ARS PHZM 2023)
- Growing Season: 28°F hard freezes about Jan 19 - Mar 19 to Nov 29 - Dec 12 (NOAA Regional Climate Centers ACIS, 1991-2020)
- Days to Maturity: 60 days
What Else to Consider for Turnip Cover Crop in California
Zone compatibility tells you about winter cold survival — but California growers also need to think about:
Drought is a persistent challenge — irrigation is essential in most regions
Wildfire risk affects rural and foothill properties
Adobe clay soils in valleys drain poorly without amendment
Wide climate variation means plant selection is highly location-specific
What to actually do about these — and the constraints that apply to every California grower, not just turnip cover crop — is covered on the California growing guide.
Timing shifts within California
Turnip Cover Crop needs about 40 days of frost-free season to complete its cycle. Even Mono County — California’s shortest season at 108 frost-free days — clears that by 68 days, so season length isn’t the constraint anywhere in California. What varies is your own parcel.
Across California’s 57 counties the frost-free season runs from 108 days in Mono County to 365 days in Ventura County — a spread of 257 days, which is why a single statewide planting date misleads. The median California county sees 317 frost-free days, leaving turnip cover crop about 277 days of slack on a typical parcel — room for a second sowing where the season runs long.
County last-freeze dates and frost-free day counts: NOAA Regional Climate Centers ACIS (1991-2020), county 28°F freeze (earlier than the folk 32°F "last frost"). Turnip Cover Crop's 40-day requirement: USDA PLANTS / Growable Ground plant database (minimum frost-free days). A parcel report resolves your address's own frost dates.
Where in California Fits Best
Even within California's zones 4b-11a, county microclimates differ enough to change what thrives. These counties carry the closest zone match for turnip cover crop (USDA PHZM 2023):
Pollinator + Wildlife Value
Turnip Cover Crop draws honeybees and native bees (moderate value, Growable Ground Plant Database). Planting it near vegetable beds can lift fruit set on neighboring crops. Outdoors, turnip cover crop can only work that bloom inside California's frost window — roughly 317 days, opening after the last 28°F freeze (Jan 19 - Mar 19) and closing at the first (Nov 29 - Dec 12), per NOAA Regional Climate Centers ACIS, 1991-2020.
California Cooperative Extension
For California-specific cultivar recommendations, planting calendars, and pest pressure for turnip cover crop, the canonical source is UC Agriculture and Natural Resources. Their fact sheets carry the local trial data we can't generalize across 50 states.
Is Turnip Cover Crop native to California?
No — the USDA PLANTS Database lists Turnip Cover Crop as introduced rather than native in the Lower 48, so it is not part of California's native flora. It grows here as a garden plant; pairing it with a few California natives keeps local pollinators fed too.
Looking for plants that belong here? The California growing guide lists USDA-documented natives for the state.
Native-range data: USDA PLANTS Database state-distribution records, accessed 2026-07-01.
Common Questions About Growing Turnip Cover Crop in California
When can I plant Turnip Cover Crop in California?
California's last spring hard freeze (28°F) clears between Jan 19 and Mar 19, and the first fall hard freeze lands between Nov 29 and Dec 12 (NOAA Regional Climate Centers ACIS, 1991-2020). Turnip Cover Crop is frost-tender — its listed minimum temperature is 50°F (USDA PLANTS Database) — so wait two to three weeks past your site's last hard freeze, when light frost has also stopped, before planting out.
Can Turnip Cover Crop mature before first frost in California?
Yes — Turnip Cover Crop matures in 60 days (USDA PLANTS Database), and California's dependable hard-freeze-free window runs 255 days (NOAA Regional Climate Centers ACIS, 1991-2020), leaving 195 days of margin. Plant once the last hard freeze has passed — two to three weeks later for anything tender — and it ripens ahead of the first fall freeze.
What hardiness zone is Turnip Cover Crop grown in across California?
California spans USDA hardiness zones 4b-11a (USDA ARS PHZM 2023). Turnip Cover Crop carries a range of zones 2-10, so the overlap zones are where outdoor growing is most reliable.
How many frost-free days does a typical California site have?
A typical California site sees ~317 frost-free days per year (derived from NOAA Regional Climate Centers ACIS, 1991-2020). Turnip Cover Crop needs 40+ frost-free days, so check whether your local microclimate runs above or below the state average before settling on a planting date.
Is Turnip Cover Crop native to California?
No — the USDA PLANTS Database lists Turnip Cover Crop as introduced rather than native in the Lower 48, so it is not part of California's native flora. It grows here as a garden plant; pairing it with a few California natives keeps local pollinators fed too.
How should I amend the soil for Turnip Cover Crop in California?
Turnip Cover Crop prefers pH 5-7 and well (dry spells) drainage (FAO ECOCROP). That sits in the common-ground band across California soils — a 30-minute soil test from a local Extension lab confirms it for your specific site.
Will Turnip Cover Crop actually grow on my specific land in California?
State-level zone + climate data is a sketch. A Growable Ground parcel report scores turnip cover crop against your address's exact soil pH, drainage, sun, and frost-date data drawn from USDA SSURGO, NOAA, and PRISM — not state averages.
Check your specific parcel in California
State-level data is a sketch. Your Growable Ground report scores turnip cover crop against your parcel's exact soil, sun, drainage, and frost data — not zone averages.
Three things about your lot that California turnip cover crop averages can't show:
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