Redlands, CA planting zone & frost dates
Redlands is in USDA hardiness zone 10a. The last spring frost usually comes around January 27 and the first fall frost around December 19, for a growing season of about 329 days.
Planting calendar for Redlands
Dates are counted from the average last spring frost (January 27) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Dec 2 – Dec 16 Transplant outdoors: Feb 3 – Feb 10 |
| Peppers | Start seeds indoors: Nov 18 – Dec 2 Transplant outdoors: Feb 10 – Feb 17 |
| Eggplant | Start seeds indoors: Nov 18 – Dec 2 Transplant outdoors: Feb 10 – Feb 17 |
| Broccoli | Start seeds indoors: Nov 18 – Dec 2 Transplant outdoors: Dec 30 – Jan 13 |
| Cabbage | Start seeds indoors: Nov 18 – Dec 2 Transplant outdoors: Dec 30 – Jan 13 |
| Onions (sets) | Plant outdoors: Dec 30 – Jan 13 |
| Peas | Sow outdoors: Dec 16 – Dec 30 |
| Spinach | Sow outdoors: Dec 16 – Dec 30 |
| Lettuce | Sow outdoors: Dec 30 – Jan 13 |
| Carrots | Sow outdoors: Dec 30 – Jan 13 |
| Potatoes | Plant outdoors: Dec 30 – Jan 13 |
| Beans | Sow outdoors: Feb 3 – Feb 10 |
| Sweet corn | Sow outdoors: Feb 3 – Feb 10 |
| Cucumbers | Sow outdoors: Feb 3 – Feb 10 |
| Squash & zucchini | Sow outdoors: Feb 3 – Feb 10 |
| Basil | Start seeds indoors: Dec 16 – Dec 30 Transplant outdoors: Feb 3 – Feb 10 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 24 (8 weeks before the average first fall frost on Dec 19).
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Dec 21 | Jan 27 | Feb 28 |
| First 32°F frost in fall is before | Jan 26 | Dec 19 | Dec 1 |
How to read it: in spring there is a 10% chance of a frost after February 28, so that is a safe date for tender plants. In fall there is a 10% chance of frost before December 1. A hard freeze (28°F) usually ends around January 7.
Hardiness zone by ZIP code in Redlands
- 92373 zone 9b
- 92374 zone 10a
- 92375 zone 10a
Nearby cities
- Highland zone 10a, last frost Jan 27
- Loma Linda zone 10a, last frost Jan 27
- San Bernardino zone 10a, last frost Jan 27
- Moreno Valley zone 9b, last frost Jan 27
- Colton zone 10a, last frost Jan 27
- Grand Terrace zone 10a
- Yucaipa zone 9b, last frost Jan 10
- Muscoy zone 10a, last frost Jan 27
Questions
What growing zone is Redlands, CA?
Redlands is in USDA Plant Hardiness Zone 10a (average extreme winter low 30°F to 35°F), according to the USDA 2023 map. Some ZIP codes of the city fall in zone 9b.
When is the last frost in Redlands?
The average last spring frost (32°F) in Redlands is January 27. There is still a 10% chance of frost until February 28.
When can I plant tomatoes in Redlands?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Feb 3 – Feb 10. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Redlands, CA (USC00047306), 2.4 km (1.5 mi) from the city center, elevation 430 m, based on 18 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.