Garden Grove, California: planting zone & frost dates
Garden Grove is in USDA plant hardiness zone 10b, where the average coldest winter night reaches 35 to 40°F (1.7 to 4.4°C). Frost is rare here.
Frost dates
Frost data comes from NOAA station SANTA ANA FIRE STN, CA (USC00047888), 5.9 mi (9.5 km) from the city center and 52 ft higher than the city center (+16 m). Record used for the 1991–2020 normals: 28 years.
Why your yard may differ from the station: microclimates.
Hardiness zone across Garden Grove
Garden Grove spans more than one half-zone. Share of the city's land area by zone (via its 5 ZIP codes): 10b (63%), 10a (37%). The headline zone is the one covering the most land. Look up your ZIP for your exact zone.
Vegetable planting calendar for Garden Grove
Windows below are for a frost-free climate: plant cool-season crops from fall through late winter and warm-season crops in late winter–spring, with a second warm-season round in late summer for some crops.
| Crop | Planting windows (frost-free climate) | |||
|---|---|---|---|---|
| Tomato | Jan 15 – Mar 31; Aug 1 – Sep 15 | |||
| Pepper | Feb 1 – Apr 15; Jul 15 – Aug 31 | |||
| Lettuce | Sep 15 – Feb 15 | |||
| Green Beans | Feb 15 – Apr 30; Aug 15 – Sep 30 | |||
| Sweet Corn | Feb 15 – Apr 15; Aug 1 – Aug 31 | |||
| Zucchini & Summer Squash | Feb 15 – Apr 15; Aug 1 – Sep 15 | |||
| Cucumber | Feb 15 – Apr 15; Aug 1 – Sep 15 | |||
| Carrot | Sep 1 – Feb 28 | |||
| Onion | Oct 15 – Jan 15 | |||
| Potato | Jan 1 – Feb 28; Sep 1 – Oct 15 | |||
| Basil | Mar 1 – Jun 30; Aug 15 – Sep 30 | |||
| Spinach | Oct 1 – Feb 15 | |||
| Kale | Sep 1 – Feb 15 | |||
| Broccoli | Sep 1 – Jan 15 | |||
| Peas | Oct 1 – Jan 31 | |||
| Eggplant | Feb 15 – Apr 30; Jul 15 – Aug 31 | |||
| Cabbage | Sep 1 – Jan 31 | |||
| Radish | Sep 15 – Mar 15 | |||
| Strawberry | Oct 1 – Nov 30 | |||
| Beets | Sep 15 – Feb 28 | |||
Nearby cities in California
- Westminster — zone 10a, frost rare
- Santa Ana — zone 10b, frost rare
- Buena Park — zone 10a, frost rare
- Huntington Beach — zone 10b, frost rare
- Orange — zone 10b, frost rare
- Fullerton — zone 10a, frost rare
More: all California cities · other zone 10b cities: San Diego, CA, San Francisco, CA, Long Beach, CA, Anaheim, CA, Irvine, CA, Santa Ana, CA, Chula Vista, CA, St. Petersburg, FL
Garden Grove gardening questions
Does it ever frost in Garden Grove, CA?
Rarely. From 1991 to 2020, NOAA's Santa Ana Fire Stn, CA station, 5.9 mi from the city center, reached 32°F in only 2% of years — too seldom for NOAA to compute frost dates. Zone 10b means the coldest night of an average winter is 35 to 40°F (1.7 to 4.4°C), so frost is essentially unknown, though cool nights can slow tropical plants.
When should I plant tomatoes in Garden Grove, CA?
Without a frost season, plant by temperature: set out tomatoes Jan 15 – Mar 31 and Aug 1 – Sep 15. Fruit set drops when nights stay above about 75°F, so avoid timing harvests for the hottest weeks. More: tomato planting by zone.
When is the best time for lettuce and broccoli in Garden Grove?
Cool-season crops do best in the mild months: plant lettuce Sep 15 – Feb 15 and broccoli Sep 1 – Jan 15. Summer heat makes lettuce bolt and broccoli flower early.
Did Garden Grove's hardiness zone change on the 2023 map?
No. Going by the zone that covers most of the city's land, Garden Grove is zone 10b 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.
Is all of Garden Grove in zone 10b?
No. Zone 10b covers about 63% of the city's land; the rest is in 10a (37%), measured across the city's 5 ZIP codes. Check your own ZIP code in the table above or with the ZIP lookup.
How does Garden Grove compare with Buena Park, CA?
Garden Grove is zone 10b and Buena Park is zone 10a. Frost is rare in both Garden Grove and Buena Park, CA (6 miles away), so both garden year-round.