Mount Laguna, CA frost dates
Last spring frostApr 22median date
First fall frostNov 8median date
Growing season200 daysfrost-free
Hardiness zone8aZone 8a
How Mount Laguna compares
- In 8 years out of 10, the last spring frost in Mount Laguna falls between March 25 and May 21, a 57-day window. The first fall frost falls between October 10 and December 4.
- The median last frost is 22 days later than the California median of Mar 31.
- Its 200-day growing season is longer than 34% of the 636 California places with a regular frost season (state median 235 days).
- The last frost is 24 days later than the zone 8a median of Mar 29. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 8a chart.
- The weather station records an average of 63 nights a year at or below 32°F.
- Nearby El Cajon, CA, 49 km away, gets only light, occasional frost, a reminder of how much elevation and distance from the coast matter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 25 |
| 50% (median) | April 22 |
| 10% (safe for tender plants) | May 21 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 10 |
| 50% (median) | November 8 |
| 90% (late) | December 4 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Mount Laguna, CA
Mount Laguna, CA frost dates — last frost Apr 22, first frost Nov 8, zone 8a. whenisthelastfrost.com
Crop
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Start indoors: Jan 28 to Feb 11Transplant outside: Mar 25 to Apr 8
Start indoors: Feb 11 to Feb 25Transplant outside: May 6 to May 20
Start indoors: Feb 11 to Feb 25Transplant outside: May 6 to May 20
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 29 to May 13
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 1 to Apr 15Sow outdoors: Mar 25 to Apr 29Plant for fall: Sep 13 to Oct 11
Start indoors: Feb 25 to Mar 11Transplant outside: Mar 25 to Apr 8Sow outdoors: Mar 25 to Apr 8Plant for fall: Aug 30 to Sep 20
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 8 to Apr 22Plant for fall: Aug 2 to Aug 23
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 1 to Apr 15Plant for fall: Aug 2 to Aug 23
Start indoors: Feb 25 to Mar 11Transplant outside: Apr 8 to Apr 22Plant for fall: Aug 2 to Aug 23
Start indoors: Mar 11 to Mar 25Transplant outside: May 13 to May 27Sow outdoors: May 13 to May 27
Start indoors: Mar 11 to Mar 25Transplant outside: Apr 29 to May 13
Sow outdoors: Mar 11 to Apr 1Plant for fall: Aug 16 to Sep 6
Sow outdoors: Mar 11 to Apr 1Plant for fall: Sep 13 to Oct 4
Sow outdoors: Mar 18 to Apr 29Plant for fall: Sep 27 to Oct 18
Start indoors: Mar 25 to Apr 1Transplant outside: May 6 to May 13Sow outdoors: Apr 29 to May 13Plant for fall: Aug 23 to Sep 6
Start indoors: Mar 25 to Apr 1Sow outdoors: Apr 29 to May 13Plant for fall: Aug 30 to Sep 13
Start indoors: Mar 25 to Apr 1Sow outdoors: Apr 29 to May 13
Start indoors: Mar 25 to Apr 1Transplant outside: May 6 to May 20
Sow outdoors: Apr 1 to Apr 29Plant for fall: Aug 16 to Aug 30
Sow outdoors: Apr 1 to Apr 29Plant for fall: Aug 30 to Sep 13
Sow outdoors: Apr 1 to Apr 22
Sow outdoors: Apr 8 to May 6Plant for fall: Aug 30 to Sep 13
Sow outdoors: Apr 8 to Apr 29Plant for fall: Sep 13 to Oct 4
Sow outdoors: Apr 29 to May 20Plant for fall: Aug 23 to Sep 6
Sow outdoors: Apr 29 to May 13
Transplant outside: May 6 to May 27
Plant for fall: Oct 25 to Nov 29
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Mount Laguna, CA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 28 – Feb 11 | Mar 25 – Apr 8 | — | — |
| Peppers | Feb 11 – Feb 25 | May 6 – May 20 | — | — |
| Eggplant | Feb 11 – Feb 25 | May 6 – May 20 | — | — |
| Tomatoes | Feb 25 – Mar 11 | Apr 29 – May 13 | — | — |
| Lettuce | Feb 25 – Mar 11 | Apr 1 – Apr 15 | Mar 25 – Apr 29 | Sep 13 – Oct 11 |
| Kale | Feb 25 – Mar 11 | Mar 25 – Apr 8 | Mar 25 – Apr 8 | Aug 30 – Sep 20 |
| Broccoli | Feb 25 – Mar 11 | Apr 8 – Apr 22 | — | Aug 2 – Aug 23 |
| Cabbage | Feb 25 – Mar 11 | Apr 1 – Apr 15 | — | Aug 2 – Aug 23 |
| Cauliflower | Feb 25 – Mar 11 | Apr 8 – Apr 22 | — | Aug 2 – Aug 23 |
| Okra | Mar 11 – Mar 25 | May 13 – May 27 | May 13 – May 27 | — |
| Basil | Mar 11 – Mar 25 | Apr 29 – May 13 | — | — |
| Peas | — | — | Mar 11 – Apr 1 | Aug 16 – Sep 6 |
| Spinach | — | — | Mar 11 – Apr 1 | Sep 13 – Oct 4 |
| Radishes | — | — | Mar 18 – Apr 29 | Sep 27 – Oct 18 |
| Cucumbers | Mar 25 – Apr 1 | May 6 – May 13 | Apr 29 – May 13 | Aug 23 – Sep 6 |
| Zucchini & Summer Squash | Mar 25 – Apr 1 | — | Apr 29 – May 13 | Aug 30 – Sep 13 |
| Winter Squash & Pumpkins | Mar 25 – Apr 1 | — | Apr 29 – May 13 | — |
| Melons & Watermelon | Mar 25 – Apr 1 | May 6 – May 20 | — | — |
| Carrots | — | — | Apr 1 – Apr 29 | Aug 16 – Aug 30 |
| Beets | — | — | Apr 1 – Apr 29 | Aug 30 – Sep 13 |
| Potatoes | — | — | Apr 1 – Apr 22 | — |
| Swiss Chard | — | — | Apr 8 – May 6 | Aug 30 – Sep 13 |
| Cilantro | — | — | Apr 8 – Apr 29 | Sep 13 – Oct 4 |
| Green Beans | — | — | Apr 29 – May 20 | Aug 23 – Sep 6 |
| Sweet Corn | — | — | Apr 29 – May 13 | — |
| Sweet Potatoes | — | May 6 – May 27 | — | — |
| Garlic | — | — | — | Oct 25 – Nov 29 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Mt Laguna #3, CA weather station, about 1 km away (elevation 5,919 ft (1,804 m)).
Frost dates near Mount Laguna
- Pine Valley Apr 22 · Nov 8
- Guatay Apr 22 · Nov 8
- Descanso Apr 19 · Oct 27
- Boulevard Apr 29 · Nov 1
- Campo Apr 30 · Oct 26
- Julian Mar 27 · Dec 1
- Alpine Feb 12 · Dec 24
- Potrero Apr 30 · Oct 26
- Jacumba Apr 29 · Nov 1
- Tecate Apr 30 · Oct 26
Frequently asked questions
When is the last frost in Mount Laguna, CA?
The median last spring frost in Mount Laguna, CA is April 22. There is still about a 10% chance of frost after May 21, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Mount Laguna, CA?
The median first fall frost is November 8, with about a 10% chance of frost before October 10.
How long is the growing season in Mount Laguna, CA?
About 200 days between the median last spring frost and first fall frost.
What planting zone is Mount Laguna, CA?
Mount Laguna, CA is in USDA hardiness zone 8a.