Fall in zone 9bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 92557 (Moreno 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, Redlands, CA (6 miles away).
Freezes are uncommon here
NOAA's normals for this station show a 32°F night in about 88% of years (about 3 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 2750% chance of a 32°F freeze after this date
- Average first fall frostDec 1950% chance of a 32°F freeze by this date
- Growing season (frost-free)329 daysmedian, 32°F threshold
- USDA hardiness zone9b25 to 30°F avg. coldest night
Get The Dial for 92557 (Moreno Valley)
Frost and freeze alerts from the NWS forecast for 92557, the spring soil-temperature heads-up for pre-emergent, and a short weekly yard-timing email.
- Freeze alerts
- Soil-temp heads-up
- Weekly yard to-dos
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.
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
77°F 55°F or warmer
24-hour average · latest 73°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Fallbrook 5 NE (37 mi).
4-inch depth
78°F 55°F or warmer
24-hour average · latest 76°F, as of Oct 18, 1:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Fallbrook 5 NE (37 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 92557 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 78°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): not yet. Apply as soil cools toward 70°F (typically 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 14 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 10–Nov 7
- Kale: fall transplant Sep 26–Oct 24
- Collards: fall transplant Sep 26–Oct 24
- Kohlrabi: fall sowing Oct 10–24
- Swiss chard: fall sowing Oct 10–24
- Beet: fall sowing Oct 10–24
- Turnip: fall sowing Oct 10–24
- Green onion / scallion: fall sowing Oct 10–24
- Strawberry (plants): fall transplant Oct 10–Nov 7
Coming up in the next 3 weeks
- Lettuce: fall transplant Oct 24–Nov 14
- Spinach: fall sowing Oct 24–Nov 14
- Brussels sprouts: start seeds indoors Nov 4–18
- Bok choy / Asian greens: fall sowing Oct 24–Nov 7
- Arugula: fall sowing Oct 24–Nov 21
- Mustard greens: fall sowing Oct 24–Nov 7
- Radish: fall sowing Nov 7–21
- Onion (bulbing): start seeds indoors Nov 4–18
- Leek: start seeds indoors Nov 4–18
- Garlic: fall sowing Nov 7–Dec 5
- Shallot: fall sowing Nov 7–Dec 5
- Celery: start seeds indoors Nov 4–18
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 21 (prior Dec) |
| 50% (the "average" last frost) | Jan 27 |
| 10% (cautious: only 1 year in 10 freezes later) | Feb 28 |
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) | Dec 1 |
| 50% (the "average" first frost) | Dec 19 |
| 90% (late: most years have frozen by now) | Jan 26 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Mar 2 | Dec 2 |
| 32°F (freeze) | Jan 27 | Dec 19 |
| 28°F (hard freeze) | Jan 7 | Jan 1 (next year) |
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 92557
Dates count from your average last spring frost (Jan 27) and first fall frost (Dec 19). 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 | Dec 2–16 | Feb 3–17 (transplant) | Aug 22–Sep 19 (transplant) |
| Pepper (sweet and hot) | Nov 18–Dec 2 | Feb 10–24 (transplant) | Aug 29–Sep 19 (transplant) |
| Eggplant | Nov 18–Dec 2 | Feb 10–24 (transplant) | Aug 29–Sep 19 (transplant) |
| Tomatillo | Dec 2–16 | Feb 3–17 (transplant) | – |
| Lettuce | Dec 2–16 | Jan 6–27 (transplant) Dec 30–Feb 10 (sow outdoors) | Oct 24–Nov 14 (transplant) Oct 10–Nov 7 (sowing) |
| Spinach | – | Dec 16–Jan 6 (sow outdoors) | Oct 24–Nov 14 (sowing) |
| Kale | Dec 2–16 | Dec 30–Jan 13 (transplant) Dec 30–Jan 13 (sow outdoors) | Sep 26–Oct 24 (transplant) Sep 12–Oct 10 (sowing) |
| Collards | Dec 2–16 | Dec 30–Jan 27 (transplant) Dec 30–Jan 27 (sow outdoors) | Sep 26–Oct 24 (transplant) Sep 12–Oct 10 (sowing) |
| Broccoli | Nov 18–Dec 2 | Dec 30–Jan 13 (transplant) | Sep 12–Oct 10 (transplant) |
| Cabbage | Nov 18–Dec 2 | Dec 30–Jan 13 (transplant) | Sep 12–Oct 10 (transplant) |
| Cauliflower | Nov 18–Dec 2 | Jan 13–27 (transplant) | Sep 12–Oct 10 (transplant) |
| Brussels sprouts | Nov 4–18 | Dec 30–Jan 13 (transplant) | Aug 29–Sep 19 (transplant) |
| Kohlrabi | Dec 2–16 | Dec 30–Jan 13 (transplant) Dec 30–Jan 13 (sow outdoors) | Oct 10–24 (sowing) |
| Bok choy / Asian greens | – | Dec 30–Jan 13 (sow outdoors) | Oct 24–Nov 7 (sowing) |
| Arugula | – | Dec 30–Jan 27 (sow outdoors) | Oct 24–Nov 21 (sowing) |
| Mustard greens | – | Dec 30–Jan 20 (sow outdoors) | Oct 24–Nov 7 (sowing) |
| Swiss chard | Dec 16–30 | Jan 13–Feb 3 (transplant) Jan 13–Feb 10 (sow outdoors) | Oct 10–24 (sowing) |
| Beet | – | Dec 30–Jan 27 (sow outdoors) | Oct 10–24 (sowing) |
| Carrot | – | Jan 6–Feb 3 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Radish | – | Dec 23–Feb 3 (sow outdoors) | Nov 7–21 (sowing) |
| Turnip | – | Dec 30–Jan 20 (sow outdoors) | Oct 10–24 (sowing) |
| Parsnip | – | Jan 6–27 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Dec 2–30 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Onion (bulbing) | Nov 4–18 | Dec 16–30 (transplant) | – |
| Green onion / scallion | – | Dec 16–Jan 13 (sow outdoors) | Oct 10–24 (sowing) |
| Leek | Nov 4–18 | Dec 30–Jan 13 (transplant) | – |
| Garlic | – | – | Nov 7–Dec 5 (sowing) |
| Shallot | – | Dec 16–30 (transplant) | Nov 7–Dec 5 (sowing) |
| Potato | – | Dec 30–Jan 13 (transplant) | Aug 29–Sep 12 (transplant) |
| Sweet potato | – | Feb 17–Mar 3 (transplant) | – |
| Sweet corn | – | Feb 3–17 (sow outdoors) | – |
| Bean, bush (snap) | – | Feb 3–17 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Bean, pole | – | Feb 3–17 (sow outdoors) | – |
| Lima bean | – | Feb 10–24 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Feb 17–Mar 10 (sow outdoors) | – |
| Cucumber | Dec 30–Jan 6 | Feb 3–17 (transplant) Feb 3–17 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Summer squash / zucchini | Dec 30–Jan 6 | Feb 3–17 (transplant) Feb 3–17 (sow outdoors) | Sep 26–Oct 10 (sowing) |
| Winter squash | Dec 30–Jan 6 | Feb 3–17 (transplant) Feb 3–17 (sow outdoors) | – |
| Pumpkin | – | Feb 3–17 (sow outdoors) | – |
| Watermelon | Dec 30–Jan 6 | Feb 10–24 (transplant) Feb 10–24 (sow outdoors) | – |
| Cantaloupe / muskmelon | Dec 30–Jan 6 | Feb 10–24 (transplant) Feb 10–24 (sow outdoors) | – |
| Okra | Dec 16–30 | Feb 10–24 (transplant) Feb 10–24 (sow outdoors) | – |
| Celery | Nov 4–18 | Feb 3–10 (transplant) | – |
| Basil | Dec 16–30 | Feb 3–17 (transplant) Feb 3–17 (sow outdoors) | – |
| Cilantro | – | Jan 13–Feb 10 (sow outdoors) | Oct 24–Nov 7 (sowing) |
| Parsley | Nov 18–Dec 2 | Jan 13–27 (transplant) Jan 6–27 (sow outdoors) | – |
| Dill | – | Jan 27–Feb 10 (sow outdoors) | Oct 24–Nov 7 (sowing) |
| Sunflower | – | Jan 27–Feb 10 (sow outdoors) | – |
| Asparagus (crowns) | – | Dec 30–Jan 13 (transplant) | – |
| Rhubarb (crowns) | – | Dec 30–Jan 13 (transplant) | – |
| Strawberry (plants) | – | Dec 30–Jan 13 (transplant) | Oct 10–Nov 7 (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: Redlands, CA (NOAA GHCN-Daily ID USC00047306), elevation 1,410 ft, 5.7 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Riverside Citrus EXP, CA | 6 mi | Jan 10 | Jan 2 (next year) |
| Riverside Fire STN 3, CA | 8 mi | Jan 9 | Dec 25 |
| Riverside Muni AP, CA | 10 mi | Jan 9 | Dec 30 |
The average last-frost dates of these stations span 18 days, a rough guide to local variation. See data sources & methods.
Frost questions for 92557
When is the last frost in 92557?
The average (50% chance) last spring freeze of 32°F for ZIP 92557 is January 27. For a more cautious planting date, use February 28, when only 1 year in 10 still sees a later freeze.
When is the first frost in 92557?
The average first fall freeze is December 19. In 1 year in 10 it comes by December 1.
What hardiness zone is 92557?
ZIP 92557 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 92557 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
92507 Riverside 92553 Moreno Valley 92521 Riverside 92324 Colton 92313 Grand Terrace 92518 March ARB 92354 Loma Linda 92350 Loma Linda
Other ZIP codes in Riverside County
91752 92201 92203 92210 92211 92220 92223 92225 92230 92234 92236 92239 92240 92241 92253 92254 92258 92260 92262 92264 92270 92274 92276 92282 All Riverside County frost dates · California frost dates
Never miss a frost: get The Dial
Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
- Soil-temp heads-up
- Weekly yard to-dos
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.