GreenlyLast and first frost dates in San Diego
United States
San Diego had no frost in 2016–2025, so crops are planted by warmth and rain rather than by frost dates.
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| Last spring frost | none in ten years |
|---|---|
| First autumn frost | none in ten years |
| Hardiness zone (USDA-equivalent) | official USDA map: 11a |
Median of 2016–2025 for the 25 km grid cell of the city: the last day at or below 0 °C in spring and the first in autumn (ERA5 reanalysis via Open-Meteo). In a cold year a frost can come a week or two later — Greenly warns 48 hours ahead.
There is no frost season here: crops are planted by warmth and rain rather than by frost dates.
What planting zone is San Diego?
The official USDA map (2023, 1991–2020 data) puts the centre of San Diego (ZIP 92101) in zone 11a. Zone 11a stands for an average coldest night of 40 to 45 °F (4.4 to 7.2 °C), so perennials hardy to zone 11a or a colder zone should come through a typical winter here.
Check the official USDA map for San Diego: USDA Plant Hardiness Zone Map.
When the soil warms up in San Diego
The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo).
| Soil | Date |
|---|---|
| 5 °C | already in the first week of January |
| 10 °C | already in the first week of January |
| 15 °C | 2 February |
| 18 °C | 24 March |
Frost dates near San Diego
Of the nearest cities on our list, the last spring frost ends earliest in Riverside (12 January) and latest in Ensenada (16 February).
| City | Distance | Last spring frost | First autumn frost |
|---|---|---|---|
| Tijuana | 26 km | — | — |
| Ensenada | 108 km | 16 February | 14 December |
| Riverside | 139 km | 12 January | 19 December |
| Mexicali | 160 km | — | — |
| Los Angeles | 179 km | — | — |
Seeds, seedlings and markets in San Diego
Within 15 km of San Diego OpenStreetMap lists 10 garden centres, 1 farm-supply shop, 10 markets and 2 farm shops (collected 20 October 2026). The nearest garden centre to the city centre is Mission Hills Nursery, 4 km away.
- Mission Hills Nursery — garden centre
Fort Stockton Drive 1525, 92103 San Diego · 4 km · missionhillsnursery.com - Foodshed Cooperative — farm supply
Fairmount Avenue 4089, 92105 · Tue 15:30–18:00; Sat 09:00–13:00 · 7 km · foodshedcooperative.com - Farmer's Market — market
Sun 09:00–14:00 · 3 km - Angel's Naturally Nuts — farm shop
Sports Arena Boulevard 3500, 92110 San Diego · Sat–Sun 07:00–16:00 · 7 km - Walter Anderson Nursery — garden centre
Enterprise Street 3642 · 08:00–17:00 · 5 km · walterandersen.com - Old Town Market — market
Twiggs Street 4010, 92110 · 5 km
Places: © OpenStreetMap contributors, ODbL.
San Diego: weather for the next 7 days
Forecast by Open-Meteo. Nights at or below 0 °C are marked as frost.
Weather in San Diego by month
Average weather in San Diego over 2016–2025: the warmest month is August. Months that average 20 °C or more by day: April–November (20.1–26.1 °C). No month averages below 0 °C at night; the coldest nights, in January, average 9.2 °C. About 351 mm of rain falls in a year, on 41 days; January is the wettest month (70 mm) and June the driest (2 mm).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days |
|---|---|---|---|---|
| January | 17.9 | 9.2 | 70 | 6 |
| February | 18.4 | 9.4 | 55 | 6 |
| March | 18.2 | 10.6 | 59 | 8 |
| April | 20.1 | 12.4 | 21 | 4 |
| May | 20.4 | 14.2 | 12 | 2 |
| June | 22.8 | 16.2 | 2 | 1 |
| July | 25 | 18.5 | 2 | 0 |
| August | 26.1 | 19.2 | 9 | 1 |
| September | 25.7 | 18.4 | 15 | 2 |
| October | 24.4 | 15.4 | 17 | 3 |
| November | 21.5 | 12 | 35 | 3 |
| December | 18.6 | 9.7 | 54 | 5 |
Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).
