Fall in zone 9bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 94558 (Napa, 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, Markley Cove, CA (8 miles away).
- Average last spring frostMar 650% chance of a 32°F freeze after this date
- Average first fall frostNov 3050% chance of a 32°F freeze by this date
- Growing season (frost-free)266 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
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 94558 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 Apr 21 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 Sep 21–Oct 19
- Lettuce: fall transplant Oct 5–26
- Spinach: fall sowing Oct 5–26
- Bok choy / Asian greens: fall sowing Oct 5–19
- Arugula: fall sowing Oct 5–Nov 2
- Mustard greens: fall sowing Oct 5–19
- Cilantro: fall sowing Oct 5–19
- Dill: fall sowing Oct 5–19
- Strawberry (plants): fall transplant Sep 21–Oct 19
Coming up in the next 3 weeks
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 30: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
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) | Jan 31 |
| 50% (the "average" last frost) | Mar 6 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 6 |
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 12 |
| 50% (the "average" first frost) | Nov 30 |
| 90% (late: most years have frozen by now) | Dec 19 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 9 | Nov 12 |
| 32°F (freeze) | Mar 6 | Nov 30 |
| 28°F (hard freeze) | Jan 22 | Dec 15 |
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 94558
Dates count from your average last spring frost (Mar 6) and first fall frost (Nov 30). 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 | Jan 9–23 | Mar 13–27 (transplant) | Aug 3–31 (transplant) |
| Pepper (sweet and hot) | Dec 26–Jan 9 | Mar 20–Apr 3 (transplant) | Aug 10–31 (transplant) |
| Eggplant | Dec 26–Jan 9 | Mar 20–Apr 3 (transplant) | Aug 10–31 (transplant) |
| Tomatillo | Jan 9–23 | Mar 13–27 (transplant) | – |
| Lettuce | Jan 9–23 | Feb 13–Mar 6 (transplant) Feb 6–Mar 20 (sow outdoors) | Oct 5–26 (transplant) Sep 21–Oct 19 (sowing) |
| Spinach | – | Jan 23–Feb 13 (sow outdoors) | Oct 5–26 (sowing) |
| Kale | Jan 9–23 | Feb 6–20 (transplant) Feb 6–20 (sow outdoors) | Sep 7–Oct 5 (transplant) Aug 24–Sep 21 (sowing) |
| Collards | Jan 9–23 | Feb 6–Mar 6 (transplant) Feb 6–Mar 6 (sow outdoors) | Sep 7–Oct 5 (transplant) Aug 24–Sep 21 (sowing) |
| Broccoli | Dec 26–Jan 9 | Feb 6–20 (transplant) | Aug 24–Sep 21 (transplant) |
| Cabbage | Dec 26–Jan 9 | Feb 6–20 (transplant) | Aug 24–Sep 21 (transplant) |
| Cauliflower | Dec 26–Jan 9 | Feb 20–Mar 6 (transplant) | Aug 24–Sep 21 (transplant) |
| Brussels sprouts | Dec 12–26 | Feb 6–20 (transplant) | Aug 10–31 (transplant) |
| Kohlrabi | Jan 9–23 | Feb 6–20 (transplant) Feb 6–20 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Bok choy / Asian greens | – | Feb 6–20 (sow outdoors) | Oct 5–19 (sowing) |
| Arugula | – | Feb 6–Mar 6 (sow outdoors) | Oct 5–Nov 2 (sowing) |
| Mustard greens | – | Feb 6–27 (sow outdoors) | Oct 5–19 (sowing) |
| Swiss chard | Jan 23–Feb 6 | Feb 20–Mar 13 (transplant) Feb 20–Mar 20 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Beet | – | Feb 6–Mar 6 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Carrot | – | Feb 13–Mar 13 (sow outdoors) | Sep 7–21 (sowing) |
| Radish | – | Jan 30–Mar 13 (sow outdoors) | Oct 19–Nov 2 (sowing) |
| Turnip | – | Feb 6–27 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Parsnip | – | Feb 13–Mar 6 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Jan 9–Feb 6 (sow outdoors) | Sep 7–21 (sowing) |
| Onion (bulbing) | Dec 12–26 | Jan 23–Feb 6 (transplant) | – |
| Green onion / scallion | – | Jan 23–Feb 20 (sow outdoors) | Sep 21–Oct 5 (sowing) |
| Leek | Dec 12–26 | Feb 6–20 (transplant) | – |
| Garlic | – | – | Oct 19–Nov 16 (sowing) |
| Shallot | – | Jan 23–Feb 6 (transplant) | Oct 19–Nov 16 (sowing) |
| Potato | – | Feb 6–20 (transplant) | Aug 10–24 (transplant) |
| Sweet potato | – | Mar 27–Apr 10 (transplant) | – |
| Sweet corn | – | Mar 13–27 (sow outdoors) | – |
| Bean, bush (snap) | – | Mar 13–27 (sow outdoors) | Sep 7–21 (sowing) |
| Bean, pole | – | Mar 13–27 (sow outdoors) | – |
| Lima bean | – | Mar 20–Apr 3 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Mar 27–Apr 17 (sow outdoors) | – |
| Cucumber | Feb 6–13 | Mar 13–27 (transplant) Mar 13–27 (sow outdoors) | Sep 7–21 (sowing) |
| Summer squash / zucchini | Feb 6–13 | Mar 13–27 (transplant) Mar 13–27 (sow outdoors) | Sep 7–21 (sowing) |
| Winter squash | Feb 6–13 | Mar 13–27 (transplant) Mar 13–27 (sow outdoors) | – |
| Pumpkin | – | Mar 13–27 (sow outdoors) | – |
| Watermelon | Feb 6–13 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | – |
| Cantaloupe / muskmelon | Feb 6–13 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | – |
| Okra | Jan 23–Feb 6 | Mar 20–Apr 3 (transplant) Mar 20–Apr 3 (sow outdoors) | – |
| Celery | Dec 12–26 | Mar 13–20 (transplant) | – |
| Basil | Jan 23–Feb 6 | Mar 13–27 (transplant) Mar 13–27 (sow outdoors) | – |
| Cilantro | – | Feb 20–Mar 20 (sow outdoors) | Oct 5–19 (sowing) |
| Parsley | Dec 26–Jan 9 | Feb 20–Mar 6 (transplant) Feb 13–Mar 6 (sow outdoors) | – |
| Dill | – | Mar 6–20 (sow outdoors) | Oct 5–19 (sowing) |
| Sunflower | – | Mar 6–20 (sow outdoors) | – |
| Asparagus (crowns) | – | Feb 6–20 (transplant) | – |
| Rhubarb (crowns) | – | Feb 6–20 (transplant) | – |
| Strawberry (plants) | – | Feb 6–20 (transplant) | Sep 21–Oct 19 (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: Markley Cove, CA (NOAA GHCN-Daily ID USC00045360), elevation 480 ft, 7.9 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 | 9 mi | Feb 12 | Dec 4 |
| Fairfield, CA | 10 mi | Jan 15 | Dec 14 |
| Lake Solano, CA | 12 mi | Feb 4 | Dec 5 |
The average last-frost dates of these stations span 53 days, a rough guide to local variation. See data sources & methods.
Frost questions for 94558
When is the last frost in 94558?
The average (50% chance) last spring freeze of 32°F for ZIP 94558 is March 6. For a more cautious planting date, use April 6, when only 1 year in 10 still sees a later freeze.
When is the first frost in 94558?
The average first fall freeze is November 30. In 1 year in 10 it comes by November 12.
What hardiness zone is 94558?
ZIP 94558 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 94558 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
95688 Vacaville 94599 Yountville 94534 Fairfield 94559 Napa 94562 Oakville 94533 Fairfield 94573 Rutherford 94503 American Canyon
Other ZIP codes in Napa County
94503 94508 94559 94562 94567 94573 94574 94576 94599 All Napa County frost dates · California frost dates
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Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
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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.