Frost dates · USDA zone 10a
Frost dates for Newark, CA
Newark, CA sees its last 32 °F night of spring around January 1 and its first of fall around December 27 — a 365-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 16 (prior winter) | Jan 14 (next year) |
| Median — 1 year in 2 | Jan 1 | Dec 27 |
| 1 year in 10 | Jan 22 | Dec 9 |
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: 365 days median, at least 343 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.
Newark planting calendar, 2027
Every row runs from the median last frost (Jan 1) and median first frost (Dec 27) 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 9 | Dec 4 | Mar 24 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Jan 1 | Jan 31 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Dec 18 | Dec 18 | Feb 1 | 45 from sow |
| Genovese BasilGenovese | Dec 4 | Jan 15 | Mar 16 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Nov 6 | Jan 8 | Mar 24 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Oct 23 | Jan 15 | Apr 20 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Nov 6 | Jan 8 | Mar 24 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Nov 6 | Jan 8 | Mar 29 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Nov 6 | Jan 8 | Mar 29 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Dec 18 | Dec 18 | Feb 26 | 70 from sow |
| TomatilloToma Verde | Nov 20 | Jan 8 | Mar 19 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Nov 20 | Jan 8 | Mar 24 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Nov 20 | Jan 8 | Mar 29 | 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 Newark grow?
Each sauce, scheduled for a Newark container garden: when the first seeds go in and when enough fruit has ripened for one batch.
Newark frost questions
When is the last frost in Newark, CA?
The median last 32 °F freeze at NEWARK, CA is January 1: half of years see a later one. One year in ten, a freeze still comes after January 22; nine years in ten, it comes after December 16 (prior winter). Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in Newark, CA?
The median first 32 °F freeze of fall is December 27. One year in ten it arrives before December 9; nine years in ten, before January 14 (next year).
How long is the growing season in Newark, CA?
NOAA counts a full 365-day freeze-free season at NEWARK, CA in a typical year. What limits a sauce garden here is heat: peppers and tomatoes drop flowers in sustained hot nights, so plant to finish before peak summer or after it breaks.
What growing zone is Newark, CA?
USDA hardiness zone 10a, per the 2023 USDA Plant Hardiness Zone Map for ZIP 94560. 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 Newark, CA?
Start Roma VF (determinate paste) seeds indoors around Nov 20 and transplant around Jan 8, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for Jan 22. First ripe fruit lands around Mar 24.
When should I plant peppers in Newark, CA?
Sow jalapeño indoors on a heat mat around Nov 6; transplant no earlier than Jan 8, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around Mar 24.
Nearby in California
- Fremontlast frost Jan 1
- Union Citylast frost Jan 2
- Mountain Viewlast frost Jan 6
- Sunnyvalelast frost Jan 6
- Milpitaslast frost Jan 12
- Haywardlast frost Jan 2
All California frost dates → · How frost-date math drives a sowing calendar →