Frost dates · USDA zone 10a
Frost dates for Chino Hills, CA
Chino Hills, CA sees its last 32 °F night of spring around January 17 and its first of fall around December 19 — a 335-day freeze-free season in a typical year.
Pick a sauce; the Plan Builder runs this station's dates and hands back the calendar, plant count and gear list.
Freeze odds, by date
| Odds | Last spring freeze after | First fall freeze before |
|---|---|---|
| 9 years in 10 | Dec 18 (prior winter) | Jan 17 (next year) |
| Median — 1 year in 2 | Jan 17 | Dec 19 |
| 1 year in 10 | Feb 22 | Nov 27 |
The top row is the risky edge: in 9 years of 10 a spring freeze still comes after it, so tender transplants set out then need cover. The bottom row is the cautious date — only 1 year in 10 freezes after it — and the one to plan uncovered tender transplants against. Freeze-free season: 335 days median, at least 293 in 9 years of 10, no freeze at all in 1 year of 10. NOAA ranks season length year by year, so it is not the gap between two rows above. A hard freeze (28 °F) has a median last date of Jan 3 and first of Dec 30.
Chino Hills planting calendar, 2027
Every row runs from the median last frost (Jan 17) and median first frost (Dec 19) above, using each cultivar's days to maturity. Same engine as the Plan Builder.
| Crop | Start indoors | Transplant / plant | First harvest | Days |
|---|---|---|---|---|
| Hardneck GarlicSiberian (porcelain hardneck) | — | Oct 15prior fall | Jun 12 | 240 from sow |
| Spanish OnionYellow Sweet Spanish (long-day) | Oct 25 | Dec 20 | Apr 9 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Jan 17 | Feb 16 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Jan 3 | Jan 3 | Feb 17 | 45 from sow |
| Genovese BasilGenovese | Dec 20 | Jan 31 | Apr 1 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Nov 22 | Jan 24 | Apr 9 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Nov 8 | Jan 31 | May 6 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Nov 22 | Jan 24 | Apr 9 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Nov 22 | Jan 24 | Apr 14 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Nov 22 | Jan 24 | Apr 14 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Jan 3 | Jan 3 | Mar 14 | 70 from sow |
| TomatilloToma Verde | Dec 6 | Jan 24 | Apr 4 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Dec 6 | Jan 24 | Apr 9 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Dec 6 | Jan 24 | Apr 14 | 80 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost: start that crop indoors on time or cover it in fall.
What sauce can Chino Hills grow?
Each sauce, scheduled for a Chino Hills container garden: when the first seeds go in and when enough fruit has ripened for one batch.
Chino Hills frost questions
When is the last frost in Chino Hills, CA?
The median last 32 °F freeze at CHINO AP, CA is January 17: half of years see a later one. One year in ten, a freeze still comes after February 22; nine years in ten, it comes after December 18 (prior winter). Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in Chino Hills, CA?
The median first 32 °F freeze of fall is December 19. One year in ten it arrives before November 27; nine years in ten, before January 17 (next year).
How long is the growing season in Chino Hills, CA?
335 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 293 days; one year in ten, no freeze at all.
What growing zone is Chino Hills, CA?
USDA hardiness zone 10a, per the 2023 USDA Plant Hardiness Zone Map for ZIP 91709. A zone describes the coldest winter night, not when frost ends, so it is the wrong number for a planting calendar — the frost dates on this page are the right one.
When should I plant tomatoes in Chino Hills, CA?
Start Roma VF (determinate paste) seeds indoors around Dec 6 and transplant around Jan 24, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for Feb 22. First ripe fruit lands around Apr 9.
When should I plant peppers in Chino Hills, CA?
Sow jalapeño indoors on a heat mat around Nov 22; transplant no earlier than Jan 24, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around Apr 9.
Nearby in California
- Chinolast frost Jan 17
- Yorba Lindafrost rare
- Anaheimfrost rare
- Diamond Barlast frost Jan 8
- Breafrost rare
- Pomonalast frost Jan 8
All California frost dates → · How frost-date math drives a sowing calendar →