Fall in zone 9bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 94534 (Fairfield, CA)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Fairfield, CA (3 miles away).
Freezes are uncommon here
NOAA's normals for this station show a 32°F night in about 88% of years (about 8 freezing night(s) a year on average). The dates below describe freeze timing for the station's record; in many years there may be no 32°F freeze at all.
- Average last spring frostJan 1550% chance of a 32°F freeze after this date
- Average first fall frostDec 1450% chance of a 32°F freeze by this date
- Growing season (frost-free)336 daysmedian, 32°F threshold
- USDA hardiness zone9b25 to 30°F avg. coldest night
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This week in your yard
As of Oct 18, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Freezes are uncommon here, so frost-based timing is rough. Local extension calendars for frost-free areas use months.
Soil temperature now
2-inch depth
No soil station with a fresh reading within 62 miles.
4-inch depth
No soil station with a fresh reading within 62 miles.
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 94534 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
No soil reading near this ZIP. Typical extension timing for your region: spring February to March; fall September to October.
Fertilizer window
Lawn region: California coastal and valleys. Timing only; always follow the product label.
- Bermudagrass (warm-season): Spring: Several weeks after the lawn is fully green (April–May) (about Mar 2 here, using green-up about 3–4 weeks after your average last frost); Summer: Every 4–6 weeks through mid-August (heaviest feeder of the group); Late: Light, low-nitrogen/high-potassium feeding about 4 weeks before first frost, or skip. Avoid: Heavy late-fall nitrogen (linked to spring dead spot).
- Tall fescue (cool-season): Early fall: September (main feeding); Late fall: November, while still green; Late winter: Optional light feeding February–March. Avoid: Feeding after mid-spring and through summer in the transition zone (stress and brown patch).
Plant now
- Lettuce: fall sowing Oct 5–Nov 2
- Kale: fall transplant Sep 21–Oct 19
- Collards: fall transplant Sep 21–Oct 19
- Kohlrabi: fall sowing Oct 5–19
- Swiss chard: fall sowing Oct 5–19
- Beet: fall sowing Oct 5–19
- Turnip: fall sowing Oct 5–19
- Green onion / scallion: fall sowing Oct 5–19
- Strawberry (plants): fall transplant Oct 5–Nov 2
Coming up in the next 3 weeks
- Pepper (sweet and hot): start seeds indoors Nov 6–20
- Eggplant: start seeds indoors Nov 6–20
- Lettuce: fall transplant Oct 19–Nov 9
- Spinach: fall sowing Oct 19–Nov 9
- Broccoli: start seeds indoors Nov 6–20
- Cabbage: start seeds indoors Nov 6–20
- Cauliflower: start seeds indoors Nov 6–20
- Brussels sprouts: start seeds indoors Oct 23–Nov 6
- Bok choy / Asian greens: fall sowing Oct 19–Nov 2
- Arugula: fall sowing Oct 19–Nov 16
- Mustard greens: fall sowing Oct 19–Nov 2
- Radish: fall sowing Nov 2–16
Prune now
No frost-timed pruning windows are open this week.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Dec 22 (prior Dec) |
| 50% (the "average" last frost) | Jan 15 |
| 10% (cautious: only 1 year in 10 freezes later) | Feb 16 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Nov 29 |
| 50% (the "average" first frost) | Dec 14 |
| 90% (late: most years have frozen by now) | Jan 9 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Feb 25 | Dec 1 |
| 32°F (freeze) | Jan 15 | Dec 14 |
| 28°F (hard freeze) | Dec 31 (prior Dec) | Dec 24 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 94534
Dates count from your average last spring frost (Jan 15) and first fall frost (Dec 14). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Nov 20–Dec 4 | Jan 22–Feb 5 (transplant) | Aug 17–Sep 14 (transplant) |
| Pepper (sweet and hot) | Nov 6–20 | Jan 29–Feb 12 (transplant) | Aug 24–Sep 14 (transplant) |
| Eggplant | Nov 6–20 | Jan 29–Feb 12 (transplant) | Aug 24–Sep 14 (transplant) |
| Tomatillo | Nov 20–Dec 4 | Jan 22–Feb 5 (transplant) | – |
| Lettuce | Nov 20–Dec 4 | Dec 25–Jan 15 (transplant) Dec 18–Jan 29 (sow outdoors) | Oct 19–Nov 9 (transplant) Oct 5–Nov 2 (sowing) |
| Spinach | – | Dec 4–25 (sow outdoors) | Oct 19–Nov 9 (sowing) |
| Kale | Nov 20–Dec 4 | Dec 18–Jan 1 (transplant) Dec 18–Jan 1 (sow outdoors) | Sep 21–Oct 19 (transplant) Sep 7–Oct 5 (sowing) |
| Collards | Nov 20–Dec 4 | Dec 18–Jan 15 (transplant) Dec 18–Jan 15 (sow outdoors) | Sep 21–Oct 19 (transplant) Sep 7–Oct 5 (sowing) |
| Broccoli | Nov 6–20 | Dec 18–Jan 1 (transplant) | Sep 7–Oct 5 (transplant) |
| Cabbage | Nov 6–20 | Dec 18–Jan 1 (transplant) | Sep 7–Oct 5 (transplant) |
| Cauliflower | Nov 6–20 | Jan 1–15 (transplant) | Sep 7–Oct 5 (transplant) |
| Brussels sprouts | Oct 23–Nov 6 | Dec 18–Jan 1 (transplant) | Aug 24–Sep 14 (transplant) |
| Kohlrabi | Nov 20–Dec 4 | Dec 18–Jan 1 (transplant) Dec 18–Jan 1 (sow outdoors) | Oct 5–19 (sowing) |
| Bok choy / Asian greens | – | Dec 18–Jan 1 (sow outdoors) | Oct 19–Nov 2 (sowing) |
| Arugula | – | Dec 18–Jan 15 (sow outdoors) | Oct 19–Nov 16 (sowing) |
| Mustard greens | – | Dec 18–Jan 8 (sow outdoors) | Oct 19–Nov 2 (sowing) |
| Swiss chard | Dec 4–18 | Jan 1–22 (transplant) Jan 1–29 (sow outdoors) | Oct 5–19 (sowing) |
| Beet | – | Dec 18–Jan 15 (sow outdoors) | Oct 5–19 (sowing) |
| Carrot | – | Dec 25–Jan 22 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Radish | – | Dec 11–Jan 22 (sow outdoors) | Nov 2–16 (sowing) |
| Turnip | – | Dec 18–Jan 8 (sow outdoors) | Oct 5–19 (sowing) |
| Parsnip | – | Dec 25–Jan 15 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Nov 20–Dec 18 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Onion (bulbing) | Oct 23–Nov 6 | Dec 4–18 (transplant) | – |
| Green onion / scallion | – | Dec 4–Jan 1 (sow outdoors) | Oct 5–19 (sowing) |
| Leek | Oct 23–Nov 6 | Dec 18–Jan 1 (transplant) | – |
| Garlic | – | – | Nov 2–30 (sowing) |
| Shallot | – | Dec 4–18 (transplant) | Nov 2–30 (sowing) |
| Potato | – | Dec 18–Jan 1 (transplant) | Aug 24–Sep 7 (transplant) |
| Sweet potato | – | Feb 5–19 (transplant) | – |
| Sweet corn | – | Jan 22–Feb 5 (sow outdoors) | – |
| Bean, bush (snap) | – | Jan 22–Feb 5 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Bean, pole | – | Jan 22–Feb 5 (sow outdoors) | – |
| Lima bean | – | Jan 29–Feb 12 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Feb 5–26 (sow outdoors) | – |
| Cucumber | Dec 18–25 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Summer squash / zucchini | Dec 18–25 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Winter squash | Dec 18–25 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Pumpkin | – | Jan 22–Feb 5 (sow outdoors) | – |
| Watermelon | Dec 18–25 | Jan 29–Feb 12 (transplant) Jan 29–Feb 12 (sow outdoors) | – |
| Cantaloupe / muskmelon | Dec 18–25 | Jan 29–Feb 12 (transplant) Jan 29–Feb 12 (sow outdoors) | – |
| Okra | Dec 4–18 | Jan 29–Feb 12 (transplant) Jan 29–Feb 12 (sow outdoors) | – |
| Celery | Oct 23–Nov 6 | Jan 22–29 (transplant) | – |
| Basil | Dec 4–18 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Cilantro | – | Jan 1–29 (sow outdoors) | Oct 19–Nov 2 (sowing) |
| Parsley | Nov 6–20 | Jan 1–15 (transplant) Dec 25–Jan 15 (sow outdoors) | – |
| Dill | – | Jan 15–29 (sow outdoors) | Oct 19–Nov 2 (sowing) |
| Sunflower | – | Jan 15–29 (sow outdoors) | – |
| Asparagus (crowns) | – | Dec 18–Jan 1 (transplant) | – |
| Rhubarb (crowns) | – | Dec 18–Jan 1 (transplant) | – |
| Strawberry (plants) | – | Dec 18–Jan 1 (transplant) | Oct 5–Nov 2 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Where these numbers come from
Station: Fairfield, CA (NOAA GHCN-Daily ID USC00042934), elevation 40 ft, 3.5 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Napa State Hospital, CA | 8 mi | Feb 12 | Dec 4 |
| Napa Co AP, CA | 9 mi | Mar 5 | Nov 21 |
| Vallejo, CA | 11 mi | Jan 17 | Dec 27 |
The average last-frost dates of these stations span 52 days, a rough guide to local variation. See data sources & methods.
Frost questions for 94534
When is the last frost in 94534?
The average (50% chance) last spring freeze of 32°F for ZIP 94534 is January 15. For a more cautious planting date, use February 16, when only 1 year in 10 still sees a later freeze.
When is the first frost in 94534?
The average first fall freeze is December 14. In 1 year in 10 it comes by November 29.
What hardiness zone is 94534?
ZIP 94534 is in USDA zone 9b (25 to 30°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 94534 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
94533 Fairfield 94503 American Canyon 94510 Benicia 94591 Vallejo 94559 Napa 94589 Vallejo 94535 Fairfield 94585 Suisun City
Other ZIP codes in Solano County
94510 94512 94533 94535 94571 94585 94589 94590 94591 94592 95620 95625 95687 95688 All Solano County frost dates · California frost dates
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Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.