Oceanside, California: planting zone & frost dates
Oceanside is in USDA plant hardiness zone 10a, where the average coldest winter night reaches 30 to 35°F (-1.1 to 1.7°C). The typical last spring frost is around Feb 4 and the first fall frost around Dec 1.
Frost dates
| Probability | Last spring frost (32°F) | First fall frost (32°F) |
|---|---|---|
| Safer (10% risk) | Feb 22 | Nov 21 |
| Typical planning date (30% risk) | Feb 4 | Dec 1 |
| Median (50%) | Jan 23 | Dec 11 |
How to read this: after the spring "10% risk" date, a 32°F frost happens in only about 1 year in 10. In fall, the "10% risk" date is the early end — a frost before it happens about 1 year in 10.
Frost data comes from NOAA station OCEANSIDE MUNI AP, CA (USW00053121), 2.5 mi (4.1 km) from the city center and 233 ft lower than the city center (-71 m). Record used for the 1991–2020 normals: 14 years.
Why your yard may differ from the station: microclimates.
Hardiness zone across Oceanside
All 5 ZIP codes covering Oceanside are in zone 10a.
Vegetable planting calendar for Oceanside
Dates are counted from the 30%-risk frost dates above (last frost Feb 4, first frost Dec 1). Shift a week later in cold spots or low-lying ground.
| Crop | Start indoors | Transplant / plant out | Direct sow | Fall crop sow/plant |
|---|---|---|---|---|
| Tomato | Dec 10 – Dec 24 | Feb 11 – Feb 25 | — | — |
| Pepper | Nov 26 – Dec 10 | Feb 18 – Mar 4 | — | — |
| Lettuce Mild winters: fall and winter plantings are usually more reliable than spring. | Dec 24 – Jan 7 | Jan 21 – Feb 11 | Jan 7 – Feb 18 | Sep 22 – Oct 20 |
| Green Beans | — | — | Feb 11 – Mar 18 | Sep 8 – Sep 22 |
| Sweet Corn | — | — | Feb 11 – Mar 11 | — |
| Zucchini & Summer Squash | Jan 7 – Jan 14 | Feb 11 – Feb 25 | Feb 11 – Mar 4 | Sep 8 – Sep 22 |
| Cucumber | Jan 7 – Jan 14 | Feb 18 – Feb 25 | Feb 11 – Mar 4 | Sep 8 – Sep 22 |
| Carrot Mild winters: fall and winter plantings are usually more reliable than spring. | — | — | Jan 14 – Feb 18 | Sep 8 – Sep 22 |
| Onion Mild winters: fall and winter plantings are usually more reliable than spring. | Nov 12 – Nov 26 | Jan 7 – Jan 21 | — | — |
| Potato Mild winters: fall and winter plantings are usually more reliable than spring. | — | Jan 7 – Jan 28 | — | — |
| Basil | Dec 24 – Jan 7 | Feb 18 – Mar 4 | Feb 18 – Mar 11 | — |
| Spinach Mild winters: fall and winter plantings are usually more reliable than spring. | — | — | Dec 24 – Jan 21 | Oct 6 – Nov 3 |
| Kale Mild winters: fall and winter plantings are usually more reliable than spring. | Dec 10 – Dec 24 | Jan 7 – Jan 28 | Jan 7 – Jan 28 | Sep 22 – Oct 20 |
| Broccoli Mild winters: fall and winter plantings are usually more reliable than spring. | Dec 10 – Dec 24 | Jan 21 – Feb 11 | — | Sep 8 – Sep 22 |
| Peas Mild winters: fall and winter plantings are usually more reliable than spring. | — | — | Dec 24 – Jan 14 | Sep 22 – Oct 6 |
| Eggplant | Nov 26 – Dec 10 | Feb 18 – Mar 4 | — | — |
| Cabbage Mild winters: fall and winter plantings are usually more reliable than spring. | Dec 10 – Dec 24 | Jan 7 – Jan 21 | — | Sep 8 – Sep 22 |
| Radish Mild winters: fall and winter plantings are usually more reliable than spring. | — | — | Dec 31 – Feb 18 | Oct 20 – Nov 17 |
| Strawberry | — | Jan 7 – Jan 28 | — | — |
| Beets Mild winters: fall and winter plantings are usually more reliable than spring. | — | — | Jan 14 – Feb 25 | Sep 22 – Oct 6 |
Nearby cities in California
- Vista — zone 10a, last frost Feb 24, first frost Dec 24
- Carlsbad — zone 10a, frost rare
- San Marcos — zone 10a, last frost Jan 14, first frost Dec 23
- Escondido — zone 10a, last frost Jan 14, first frost Dec 23
- Temecula — zone 9b, last frost Feb 14, first frost Jan 3
- Murrieta — zone 10a, last frost Feb 14, first frost Jan 3
More: all California cities · other zone 10a cities: Los Angeles, CA, Oakland, CA, Tampa, FL, Orlando, FL, Riverside, CA, Corpus Christi, TX, Port St. Lucie, FL, Scottsdale, AZ
Oceanside gardening questions
When is the last frost in Oceanside, CA?
Plan around Feb 4. At NOAA's Oceanside Municipal Airport, CA station, 2.5 mi from the city center, there is a 30% chance of a 32°F frost after that date. Half of springs have their last frost by Jan 23, and after Feb 22 the risk drops to about 1 in 10. A hard freeze (28°F) usually ends earlier, around Dec 31. Springs here are erratic: 62 days separate the 90% and 10% dates, versus a median of 36 days for cities on this site, so watch the forecast rather than the calendar.
When should I plant tomatoes in Oceanside, CA?
Start seeds indoors Dec 10 – Dec 24 and set transplants outside Feb 11 – Feb 25, once nights stay above 50°F and the soil is near 60°F. With about 300 frost-free days, frost is not the main limit — fruit set drops when nights stay above about 75°F, so early plantings tend to do best. More: tomato planting dates by zone.
How long is the growing season in Oceanside?
About 325 days without a 32°F frost in a typical (median) year. In 9 years out of 10 the season lasts at least 287 days, and in 1 year in 10 it runs 360 days or more. In fall there is a 10% chance of frost by Nov 21 and a 30% chance by Dec 1. That ranks 61st longest of 84 California cities on this site.
When should I plant a fall garden in Oceanside?
Count back from the first fall frost (Dec 1): transplant broccoli Sep 8 – Sep 22; sow kale Sep 22 – Oct 20; sow lettuce Sep 22 – Oct 20; sow radishes Oct 20 – Nov 17. Hardy crops keep growing through light frosts; the median 28°F hard freeze here is Dec 23. How the math works: succession and fall planting.
Did Oceanside's hardiness zone change on the 2023 map?
No. Going by the zone that covers most of the city's land, Oceanside is zone 10a on both the 2012 and the 2023 USDA maps (PRISM/OSU ZIP listings). About 42% of U.S. ZIP codes kept their half-zone in 2023. Why the 2023 map is warmer.
How does Oceanside compare with Vista, CA?
Both are in zone 10a. The typical last spring frost in Oceanside (Feb 4) comes about 20 days earlier than in Vista, CA (Feb 24), 5 miles away, and the first fall frost is Dec 1 versus Dec 24. Oceanside sits about 185 ft lower, which explains part of the gap. The two cities use different NOAA stations.