Fall in zone 10aPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 93063 (Simi Valley, 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, Newhall 5NW, CA (8 miles away).
Freezes are uncommon here
NOAA's normals for this station show a 32°F night in about 37% of years (about 1 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 850% chance of a 32°F freeze after this date
- Average first fall frostJan 1 (next year)50% chance of a 32°F freeze by this date
- Growing season (frost-free)year-round in a typical yearmedian, 32°F threshold
- USDA hardiness zone10a30 to 35°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 93063 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 Feb 23 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
- Kale: fall sowing Sep 25–Oct 23
- Kale: fall transplant Oct 9–Nov 6
- Collards: fall sowing Sep 25–Oct 23
- Collards: fall transplant Oct 9–Nov 6
- Broccoli: fall transplant Sep 25–Oct 23
- Cabbage: fall transplant Sep 25–Oct 23
- Cauliflower: fall transplant Sep 25–Oct 23
- Brussels sprouts: start seeds indoors Oct 16–30
- Carrot: fall sowing Oct 9–23
- Pea (garden, snap, snow): fall sowing Oct 9–23
- Onion (bulbing): start seeds indoors Oct 16–30
- Leek: start seeds indoors Oct 16–30
- Bean, bush (snap): fall sowing Oct 9–23
- Cucumber: fall sowing Oct 9–23
- Summer squash / zucchini: fall sowing Oct 9–23
- Celery: start seeds indoors Oct 16–30
Coming up in the next 3 weeks
- Pepper (sweet and hot): start seeds indoors Oct 30–Nov 13
- Eggplant: start seeds indoors Oct 30–Nov 13
- Lettuce: fall sowing Oct 23–Nov 20
- Lettuce: fall transplant Nov 6–27
- Spinach: fall sowing Nov 6–27
- Broccoli: start seeds indoors Oct 30–Nov 13
- Cabbage: start seeds indoors Oct 30–Nov 13
- Cauliflower: start seeds indoors Oct 30–Nov 13
- Kohlrabi: fall sowing Oct 23–Nov 6
- Bok choy / Asian greens: fall sowing Nov 6–20
- Arugula: fall sowing Nov 6–Dec 4
- Mustard greens: fall sowing Nov 6–20
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 8 (prior Dec) |
| 50% (the "average" last frost) | Jan 8 |
| 10% (cautious: only 1 year in 10 freezes later) | Mar 10 |
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 30 |
| 50% (the "average" first frost) | Jan 1 (next year) |
| 90% (late: most years have frozen by now) | Feb 25 (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 22 | Dec 19 |
| 32°F (freeze) | Jan 8 | Jan 1 (next year) |
| 28°F (hard freeze) | n/a | n/a |
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 93063
Dates count from your average last spring frost (Jan 8) and first fall frost (Jan 1). 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 13–27 | Jan 15–29 (transplant) | Sep 4–Oct 2 (transplant) |
| Pepper (sweet and hot) | Oct 30–Nov 13 | Jan 22–Feb 5 (transplant) | Sep 11–Oct 2 (transplant) |
| Eggplant | Oct 30–Nov 13 | Jan 22–Feb 5 (transplant) | Sep 11–Oct 2 (transplant) |
| Tomatillo | Nov 13–27 | Jan 15–29 (transplant) | – |
| Lettuce | Nov 13–27 | Dec 18–Jan 8 (transplant) Dec 11–Jan 22 (sow outdoors) | Nov 6–27 (transplant) Oct 23–Nov 20 (sowing) |
| Spinach | – | Nov 27–Dec 18 (sow outdoors) | Nov 6–27 (sowing) |
| Kale | Nov 13–27 | Dec 11–25 (transplant) Dec 11–25 (sow outdoors) | Oct 9–Nov 6 (transplant) Sep 25–Oct 23 (sowing) |
| Collards | Nov 13–27 | Dec 11–Jan 8 (transplant) Dec 11–Jan 8 (sow outdoors) | Oct 9–Nov 6 (transplant) Sep 25–Oct 23 (sowing) |
| Broccoli | Oct 30–Nov 13 | Dec 11–25 (transplant) | Sep 25–Oct 23 (transplant) |
| Cabbage | Oct 30–Nov 13 | Dec 11–25 (transplant) | Sep 25–Oct 23 (transplant) |
| Cauliflower | Oct 30–Nov 13 | Dec 25–Jan 8 (transplant) | Sep 25–Oct 23 (transplant) |
| Brussels sprouts | Oct 16–30 | Dec 11–25 (transplant) | Sep 11–Oct 2 (transplant) |
| Kohlrabi | Nov 13–27 | Dec 11–25 (transplant) Dec 11–25 (sow outdoors) | Oct 23–Nov 6 (sowing) |
| Bok choy / Asian greens | – | Dec 11–25 (sow outdoors) | Nov 6–20 (sowing) |
| Arugula | – | Dec 11–Jan 8 (sow outdoors) | Nov 6–Dec 4 (sowing) |
| Mustard greens | – | Dec 11–Jan 1 (sow outdoors) | Nov 6–20 (sowing) |
| Swiss chard | Nov 27–Dec 11 | Dec 25–Jan 15 (transplant) Dec 25–Jan 22 (sow outdoors) | Oct 23–Nov 6 (sowing) |
| Beet | – | Dec 11–Jan 8 (sow outdoors) | Oct 23–Nov 6 (sowing) |
| Carrot | – | Dec 18–Jan 15 (sow outdoors) | Oct 9–23 (sowing) |
| Radish | – | Dec 4–Jan 15 (sow outdoors) | Nov 20–Dec 4 (sowing) |
| Turnip | – | Dec 11–Jan 1 (sow outdoors) | Oct 23–Nov 6 (sowing) |
| Parsnip | – | Dec 18–Jan 8 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Nov 13–Dec 11 (sow outdoors) | Oct 9–23 (sowing) |
| Onion (bulbing) | Oct 16–30 | Nov 27–Dec 11 (transplant) | – |
| Green onion / scallion | – | Nov 27–Dec 25 (sow outdoors) | Oct 23–Nov 6 (sowing) |
| Leek | Oct 16–30 | Dec 11–25 (transplant) | – |
| Garlic | – | – | Nov 20–Dec 18 (sowing) |
| Shallot | – | Nov 27–Dec 11 (transplant) | Nov 20–Dec 18 (sowing) |
| Potato | – | Dec 11–25 (transplant) | Sep 11–25 (transplant) |
| Sweet potato | – | Jan 29–Feb 12 (transplant) | – |
| Sweet corn | – | Jan 15–29 (sow outdoors) | – |
| Bean, bush (snap) | – | Jan 15–29 (sow outdoors) | Oct 9–23 (sowing) |
| Bean, pole | – | Jan 15–29 (sow outdoors) | – |
| Lima bean | – | Jan 22–Feb 5 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Jan 29–Feb 19 (sow outdoors) | – |
| Cucumber | Dec 11–18 | Jan 15–29 (transplant) Jan 15–29 (sow outdoors) | Oct 9–23 (sowing) |
| Summer squash / zucchini | Dec 11–18 | Jan 15–29 (transplant) Jan 15–29 (sow outdoors) | Oct 9–23 (sowing) |
| Winter squash | Dec 11–18 | Jan 15–29 (transplant) Jan 15–29 (sow outdoors) | – |
| Pumpkin | – | Jan 15–29 (sow outdoors) | – |
| Watermelon | Dec 11–18 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Cantaloupe / muskmelon | Dec 11–18 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Okra | Nov 27–Dec 11 | Jan 22–Feb 5 (transplant) Jan 22–Feb 5 (sow outdoors) | – |
| Celery | Oct 16–30 | Jan 15–22 (transplant) | – |
| Basil | Nov 27–Dec 11 | Jan 15–29 (transplant) Jan 15–29 (sow outdoors) | – |
| Cilantro | – | Dec 25–Jan 22 (sow outdoors) | Nov 6–20 (sowing) |
| Parsley | Oct 30–Nov 13 | Dec 25–Jan 8 (transplant) Dec 18–Jan 8 (sow outdoors) | – |
| Dill | – | Jan 8–22 (sow outdoors) | Nov 6–20 (sowing) |
| Sunflower | – | Jan 8–22 (sow outdoors) | – |
| Asparagus (crowns) | – | Dec 11–25 (transplant) | – |
| Rhubarb (crowns) | – | Dec 11–25 (transplant) | – |
| Strawberry (plants) | – | Dec 11–25 (transplant) | Oct 23–Nov 20 (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: Newhall 5NW, CA (NOAA GHCN-Daily ID USC00046161), elevation 1,765 ft, 8.0 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Northridge Cal State, CA | 10 mi | Jan 2 | Jan 1 (next year) |
| Woodland Hills Pierce College, CA | 11 mi | Jan 24 | Dec 15 |
| Van Nuys AP, CA | 13 mi | Dec 31 (prior Dec) | Dec 30 |
The average last-frost dates of these stations span 24 days, a rough guide to local variation. See data sources & methods.
Frost questions for 93063
When is the last frost in 93063?
The average (50% chance) last spring freeze of 32°F for ZIP 93063 is January 8. For a more cautious planting date, use March 10, when only 1 year in 10 still sees a later freeze.
When is the first frost in 93063?
The average first fall freeze is January 1 (next year). In 1 year in 10 it comes by November 30.
What hardiness zone is 93063?
ZIP 93063 is in USDA zone 10a (30 to 35°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 93063 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
93064 91311 Los Angeles 93065 Simi Valley 91304 Los Angeles 91381 Stevenson Ranch 91307 Los Angeles 91326 Los Angeles 91303 Los Angeles
Other ZIP codes in Ventura County
91320 91360 91361 91362 91377 93001 93003 93004 93010 93012 93015 93021 93022 93023 93030 93033 93035 93036 93040 93041 93042 93043 93060 93064 All Ventura County frost dates · California frost dates
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- 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.