Fall in zone 9bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 95391 (Mountain House, 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, Tracy Pumping Plt, CA (1 miles away).
- Average last spring frostJan 1950% chance of a 32°F freeze after this date
- Average first fall frostDec 1050% chance of a 32°F freeze by this date
- Growing season (frost-free)330 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
69°F 55°F or warmer
24-hour average · latest 69°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Merced 23 WSW (54 mi).
4-inch depth
68°F 55°F or warmer
24-hour average · latest 68°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Merced 23 WSW (54 mi).
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 95391 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 68°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): window open as soil cools through the 70s and 60s.
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 6 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 1–29
- Lettuce: fall transplant Oct 15–Nov 5
- Spinach: fall sowing Oct 15–Nov 5
- Bok choy / Asian greens: fall sowing Oct 15–29
- Arugula: fall sowing Oct 15–Nov 12
- Mustard greens: fall sowing Oct 15–29
- Cilantro: fall sowing Oct 15–29
- Dill: fall sowing Oct 15–29
- Strawberry (plants): fall transplant Oct 1–29
Coming up in the next 3 weeks
- Brussels sprouts: start seeds indoors Oct 27–Nov 10
- Radish: fall sowing Oct 29–Nov 12
- Onion (bulbing): start seeds indoors Oct 27–Nov 10
- Leek: start seeds indoors Oct 27–Nov 10
- Garlic: fall sowing Oct 29–Nov 26
- Shallot: fall sowing Oct 29–Nov 26
- Celery: start seeds indoors Oct 27–Nov 10
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Dec 10: 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) | Dec 25 (prior Dec) |
| 50% (the "average" last frost) | Jan 19 |
| 10% (cautious: only 1 year in 10 freezes later) | Feb 17 |
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 26 |
| 50% (the "average" first frost) | Dec 10 |
| 90% (late: most years have frozen by now) | Jan 7 (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 21 | Nov 29 |
| 32°F (freeze) | Jan 19 | Dec 10 |
| 28°F (hard freeze) | Jan 1 | Dec 22 |
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 95391
Dates count from your average last spring frost (Jan 19) and first fall frost (Dec 10). 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 24–Dec 8 | Jan 26–Feb 9 (transplant) | Aug 13–Sep 10 (transplant) |
| Pepper (sweet and hot) | Nov 10–24 | Feb 2–16 (transplant) | Aug 20–Sep 10 (transplant) |
| Eggplant | Nov 10–24 | Feb 2–16 (transplant) | Aug 20–Sep 10 (transplant) |
| Tomatillo | Nov 24–Dec 8 | Jan 26–Feb 9 (transplant) | – |
| Lettuce | Nov 24–Dec 8 | Dec 29–Jan 19 (transplant) Dec 22–Feb 2 (sow outdoors) | Oct 15–Nov 5 (transplant) Oct 1–29 (sowing) |
| Spinach | – | Dec 8–29 (sow outdoors) | Oct 15–Nov 5 (sowing) |
| Kale | Nov 24–Dec 8 | Dec 22–Jan 5 (transplant) Dec 22–Jan 5 (sow outdoors) | Sep 17–Oct 15 (transplant) Sep 3–Oct 1 (sowing) |
| Collards | Nov 24–Dec 8 | Dec 22–Jan 19 (transplant) Dec 22–Jan 19 (sow outdoors) | Sep 17–Oct 15 (transplant) Sep 3–Oct 1 (sowing) |
| Broccoli | Nov 10–24 | Dec 22–Jan 5 (transplant) | Sep 3–Oct 1 (transplant) |
| Cabbage | Nov 10–24 | Dec 22–Jan 5 (transplant) | Sep 3–Oct 1 (transplant) |
| Cauliflower | Nov 10–24 | Jan 5–19 (transplant) | Sep 3–Oct 1 (transplant) |
| Brussels sprouts | Oct 27–Nov 10 | Dec 22–Jan 5 (transplant) | Aug 20–Sep 10 (transplant) |
| Kohlrabi | Nov 24–Dec 8 | Dec 22–Jan 5 (transplant) Dec 22–Jan 5 (sow outdoors) | Oct 1–15 (sowing) |
| Bok choy / Asian greens | – | Dec 22–Jan 5 (sow outdoors) | Oct 15–29 (sowing) |
| Arugula | – | Dec 22–Jan 19 (sow outdoors) | Oct 15–Nov 12 (sowing) |
| Mustard greens | – | Dec 22–Jan 12 (sow outdoors) | Oct 15–29 (sowing) |
| Swiss chard | Dec 8–22 | Jan 5–26 (transplant) Jan 5–Feb 2 (sow outdoors) | Oct 1–15 (sowing) |
| Beet | – | Dec 22–Jan 19 (sow outdoors) | Oct 1–15 (sowing) |
| Carrot | – | Dec 29–Jan 26 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Radish | – | Dec 15–Jan 26 (sow outdoors) | Oct 29–Nov 12 (sowing) |
| Turnip | – | Dec 22–Jan 12 (sow outdoors) | Oct 1–15 (sowing) |
| Parsnip | – | Dec 29–Jan 19 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Nov 24–Dec 22 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Onion (bulbing) | Oct 27–Nov 10 | Dec 8–22 (transplant) | – |
| Green onion / scallion | – | Dec 8–Jan 5 (sow outdoors) | Oct 1–15 (sowing) |
| Leek | Oct 27–Nov 10 | Dec 22–Jan 5 (transplant) | – |
| Garlic | – | – | Oct 29–Nov 26 (sowing) |
| Shallot | – | Dec 8–22 (transplant) | Oct 29–Nov 26 (sowing) |
| Potato | – | Dec 22–Jan 5 (transplant) | Aug 20–Sep 3 (transplant) |
| Sweet potato | – | Feb 9–23 (transplant) | – |
| Sweet corn | – | Jan 26–Feb 9 (sow outdoors) | – |
| Bean, bush (snap) | – | Jan 26–Feb 9 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Bean, pole | – | Jan 26–Feb 9 (sow outdoors) | – |
| Lima bean | – | Feb 2–16 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Feb 9–Mar 2 (sow outdoors) | – |
| Cucumber | Dec 22–29 | Jan 26–Feb 9 (transplant) Jan 26–Feb 9 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Summer squash / zucchini | Dec 22–29 | Jan 26–Feb 9 (transplant) Jan 26–Feb 9 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Winter squash | Dec 22–29 | Jan 26–Feb 9 (transplant) Jan 26–Feb 9 (sow outdoors) | – |
| Pumpkin | – | Jan 26–Feb 9 (sow outdoors) | – |
| Watermelon | Dec 22–29 | Feb 2–16 (transplant) Feb 2–16 (sow outdoors) | – |
| Cantaloupe / muskmelon | Dec 22–29 | Feb 2–16 (transplant) Feb 2–16 (sow outdoors) | – |
| Okra | Dec 8–22 | Feb 2–16 (transplant) Feb 2–16 (sow outdoors) | – |
| Celery | Oct 27–Nov 10 | Jan 26–Feb 2 (transplant) | – |
| Basil | Dec 8–22 | Jan 26–Feb 9 (transplant) Jan 26–Feb 9 (sow outdoors) | – |
| Cilantro | – | Jan 5–Feb 2 (sow outdoors) | Oct 15–29 (sowing) |
| Parsley | Nov 10–24 | Jan 5–19 (transplant) Dec 29–Jan 19 (sow outdoors) | – |
| Dill | – | Jan 19–Feb 2 (sow outdoors) | Oct 15–29 (sowing) |
| Sunflower | – | Jan 19–Feb 2 (sow outdoors) | – |
| Asparagus (crowns) | – | Dec 22–Jan 5 (transplant) | – |
| Rhubarb (crowns) | – | Dec 22–Jan 5 (transplant) | – |
| Strawberry (plants) | – | Dec 22–Jan 5 (transplant) | Oct 1–29 (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: Tracy Pumping Plt, CA (NOAA GHCN-Daily ID USC00049001), elevation 61 ft, 1.3 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Livermore, CA | 13 mi | Feb 15 | Dec 2 |
| Livermore Muni AP, CA | 13 mi | Feb 27 | Dec 1 |
| Tracy Carbona, CA | 15 mi | Feb 25 | Nov 26 |
The average last-frost dates of these stations span 39 days, a rough guide to local variation. See data sources & methods.
Frost questions for 95391
When is the last frost in 95391?
The average (50% chance) last spring freeze of 32°F for ZIP 95391 is January 19. For a more cautious planting date, use February 17, when only 1 year in 10 still sees a later freeze.
When is the first frost in 95391?
The average first fall freeze is December 10. In 1 year in 10 it comes by November 26.
What hardiness zone is 95391?
ZIP 95391 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 95391 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
94514 Byron 94505 Discovery Bay 94551 Livermore 95377 Tracy 95376 Tracy 94513 Brentwood 94548 Knightsen 95304
Other ZIP codes in Alameda County
94501 94502 94536 94538 94539 94541 94542 94544 94545 94546 94550 94551 94552 94555 94560 94566 94568 94577 94578 94579 94580 94586 94587 94588 All Alameda 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.