Fall in zone 9bPhoto: George Chernilevsky, Public domain, via Wikimedia Commons
Frost dates for ZIP 93237 (Three Rivers, 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, Three Rivers Edison Ph 1, CA (2 miles away).
- Average last spring frostMar 1650% chance of a 32°F freeze after this date
- Average first fall frostNov 2650% chance of a 32°F freeze by this date
- Growing season (frost-free)249 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
64°F 55°F or warmer
24-hour average · latest 56°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Alabama Hills (43 mi).
4-inch depth
64°F 55°F or warmer
24-hour average · latest 63°F, as of Oct 18, 2:00 AM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Alabama Hills (43 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 93237 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 64°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 May 1 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 transplant Oct 1–22
- Spinach: fall sowing Oct 1–22
- Arugula: fall sowing Oct 1–29
- Radish: fall sowing Oct 15–29
- Garlic: fall sowing Oct 15–Nov 12
- Shallot: fall sowing Oct 15–Nov 12
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Nov 26: 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) | Feb 5 |
| 50% (the "average" last frost) | Mar 16 |
| 10% (cautious: only 1 year in 10 freezes later) | Apr 14 |
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 5 |
| 50% (the "average" first frost) | Nov 26 |
| 90% (late: most years have frozen by now) | Dec 12 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Apr 13 | Nov 10 |
| 32°F (freeze) | Mar 16 | Nov 26 |
| 28°F (hard freeze) | Jan 30 | Dec 11 |
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 93237
Dates count from your average last spring frost (Mar 16) and first fall frost (Nov 26). 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 19–Feb 2 | Mar 23–Apr 6 (transplant) | Jul 30–Aug 27 (transplant) |
| Pepper (sweet and hot) | Jan 5–19 | Mar 30–Apr 13 (transplant) | Aug 6–27 (transplant) |
| Eggplant | Jan 5–19 | Mar 30–Apr 13 (transplant) | Aug 6–27 (transplant) |
| Tomatillo | Jan 19–Feb 2 | Mar 23–Apr 6 (transplant) | – |
| Lettuce | Jan 19–Feb 2 | Feb 23–Mar 16 (transplant) Feb 16–Mar 30 (sow outdoors) | Oct 1–22 (transplant) Sep 17–Oct 15 (sowing) |
| Spinach | – | Feb 2–23 (sow outdoors) | Oct 1–22 (sowing) |
| Kale | Jan 19–Feb 2 | Feb 16–Mar 2 (transplant) Feb 16–Mar 2 (sow outdoors) | Sep 3–Oct 1 (transplant) Aug 20–Sep 17 (sowing) |
| Collards | Jan 19–Feb 2 | Feb 16–Mar 16 (transplant) Feb 16–Mar 16 (sow outdoors) | Sep 3–Oct 1 (transplant) Aug 20–Sep 17 (sowing) |
| Broccoli | Jan 5–19 | Feb 16–Mar 2 (transplant) | Aug 20–Sep 17 (transplant) |
| Cabbage | Jan 5–19 | Feb 16–Mar 2 (transplant) | Aug 20–Sep 17 (transplant) |
| Cauliflower | Jan 5–19 | Mar 2–16 (transplant) | Aug 20–Sep 17 (transplant) |
| Brussels sprouts | Dec 22–Jan 5 | Feb 16–Mar 2 (transplant) | Aug 6–27 (transplant) |
| Kohlrabi | Jan 19–Feb 2 | Feb 16–Mar 2 (transplant) Feb 16–Mar 2 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Bok choy / Asian greens | – | Feb 16–Mar 2 (sow outdoors) | Oct 1–15 (sowing) |
| Arugula | – | Feb 16–Mar 16 (sow outdoors) | Oct 1–29 (sowing) |
| Mustard greens | – | Feb 16–Mar 9 (sow outdoors) | Oct 1–15 (sowing) |
| Swiss chard | Feb 2–16 | Mar 2–23 (transplant) Mar 2–30 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Beet | – | Feb 16–Mar 16 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Carrot | – | Feb 23–Mar 23 (sow outdoors) | Sep 3–17 (sowing) |
| Radish | – | Feb 9–Mar 23 (sow outdoors) | Oct 15–29 (sowing) |
| Turnip | – | Feb 16–Mar 9 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Parsnip | – | Feb 23–Mar 16 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Jan 19–Feb 16 (sow outdoors) | Sep 3–17 (sowing) |
| Onion (bulbing) | Dec 22–Jan 5 | Feb 2–16 (transplant) | – |
| Green onion / scallion | – | Feb 2–Mar 2 (sow outdoors) | Sep 17–Oct 1 (sowing) |
| Leek | Dec 22–Jan 5 | Feb 16–Mar 2 (transplant) | – |
| Garlic | – | – | Oct 15–Nov 12 (sowing) |
| Shallot | – | Feb 2–16 (transplant) | Oct 15–Nov 12 (sowing) |
| Potato | – | Feb 16–Mar 2 (transplant) | Aug 6–20 (transplant) |
| Sweet potato | – | Apr 6–20 (transplant) | – |
| Sweet corn | – | Mar 23–Apr 6 (sow outdoors) | – |
| Bean, bush (snap) | – | Mar 23–Apr 6 (sow outdoors) | Sep 3–17 (sowing) |
| Bean, pole | – | Mar 23–Apr 6 (sow outdoors) | – |
| Lima bean | – | Mar 30–Apr 13 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Apr 6–27 (sow outdoors) | – |
| Cucumber | Feb 16–23 | Mar 23–Apr 6 (transplant) Mar 23–Apr 6 (sow outdoors) | Sep 3–17 (sowing) |
| Summer squash / zucchini | Feb 16–23 | Mar 23–Apr 6 (transplant) Mar 23–Apr 6 (sow outdoors) | Sep 3–17 (sowing) |
| Winter squash | Feb 16–23 | Mar 23–Apr 6 (transplant) Mar 23–Apr 6 (sow outdoors) | – |
| Pumpkin | – | Mar 23–Apr 6 (sow outdoors) | – |
| Watermelon | Feb 16–23 | Mar 30–Apr 13 (transplant) Mar 30–Apr 13 (sow outdoors) | – |
| Cantaloupe / muskmelon | Feb 16–23 | Mar 30–Apr 13 (transplant) Mar 30–Apr 13 (sow outdoors) | – |
| Okra | Feb 2–16 | Mar 30–Apr 13 (transplant) Mar 30–Apr 13 (sow outdoors) | – |
| Celery | Dec 22–Jan 5 | Mar 23–30 (transplant) | – |
| Basil | Feb 2–16 | Mar 23–Apr 6 (transplant) Mar 23–Apr 6 (sow outdoors) | – |
| Cilantro | – | Mar 2–30 (sow outdoors) | Oct 1–15 (sowing) |
| Parsley | Jan 5–19 | Mar 2–16 (transplant) Feb 23–Mar 16 (sow outdoors) | – |
| Dill | – | Mar 16–30 (sow outdoors) | Oct 1–15 (sowing) |
| Sunflower | – | Mar 16–30 (sow outdoors) | – |
| Asparagus (crowns) | – | Feb 16–Mar 2 (transplant) | – |
| Rhubarb (crowns) | – | Feb 16–Mar 2 (transplant) | – |
| Strawberry (plants) | – | Feb 16–Mar 2 (transplant) | Sep 17–Oct 15 (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: Three Rivers Edison Ph 1, CA (NOAA GHCN-Daily ID USC00048917), elevation 1,140 ft, 2.4 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Ash Mtn, CA | 5 mi | Mar 12 | Dec 9 |
| Lemon Cove, CA | 9 mi | Feb 5 | Dec 8 |
| Lodgepole, CA | 13 mi | Jun 8 | Sep 20 |
The average last-frost dates of these stations span 127 days, a rough guide to local variation. See data sources & methods.
Frost questions for 93237
When is the last frost in 93237?
The average (50% chance) last spring freeze of 32°F for ZIP 93237 is March 16. For a more cautious planting date, use April 14, when only 1 year in 10 still sees a later freeze.
When is the first frost in 93237?
The average first fall freeze is November 26. In 1 year in 10 it comes by November 5.
What hardiness zone is 93237?
ZIP 93237 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 93237 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
93271 Three Rivers 93603 Hartland 93244 Lemon Cove 93286 Woodlake 93262 Silver City 93221 Exeter 93647 Orosi 93641
Other ZIP codes in Tulare County
93201 93207 93208 93218 93219 93221 93223 93227 93235 93238 93244 93247 93256 93257 93258 93260 93261 93262 93265 93267 93270 93271 93272 93274 All Tulare 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.