Crestline, CA planting zone & frost dates
Crestline is in USDA hardiness zone 8b. The last spring frost usually comes around May 5 and the first fall frost around November 2, for a growing season of about 176 days.
Planting calendar for Crestline
Dates are counted from the average last spring frost (May 5) 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: Mar 10 – Mar 24 Transplant outdoors: May 12 – May 19 |
| Peppers | Start seeds indoors: Feb 24 – Mar 10 Transplant outdoors: May 19 – May 26 |
| Eggplant | Start seeds indoors: Feb 24 – Mar 10 Transplant outdoors: May 19 – May 26 |
| Broccoli | Start seeds indoors: Feb 24 – Mar 10 Transplant outdoors: Apr 7 – Apr 21 |
| Cabbage | Start seeds indoors: Feb 24 – Mar 10 Transplant outdoors: Apr 7 – Apr 21 |
| Onions (sets) | Plant outdoors: Apr 7 – Apr 21 |
| Peas | Sow outdoors: Mar 24 – Apr 7 |
| Spinach | Sow outdoors: Mar 24 – Apr 7 |
| Lettuce | Sow outdoors: Apr 7 – Apr 21 |
| Carrots | Sow outdoors: Apr 7 – Apr 21 |
| Potatoes | Plant outdoors: Apr 7 – Apr 21 |
| Beans | Sow outdoors: May 12 – May 19 |
| Sweet corn | Sow outdoors: May 12 – May 19 |
| Cucumbers | Sow outdoors: May 12 – May 19 |
| Squash & zucchini | Sow outdoors: May 12 – May 19 |
| Basil | Start seeds indoors: Mar 24 – Apr 7 Transplant outdoors: May 12 – May 19 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 7 (8 weeks before the average first fall frost on Nov 2).
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 9 | May 5 | May 31 |
| First 32°F frost in fall is before | Nov 15 | Nov 2 | Oct 12 |
How to read it: in spring there is a 10% chance of a frost after May 31, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 12. A hard freeze (28°F) usually ends around April 11.
Hardiness zone by ZIP code in Crestline
- 92325 zone 8b
Nearby cities
- Lake Arrowhead zone 8a, last frost May 5
- Muscoy zone 10a, last frost Jan 27
- San Bernardino zone 10a, last frost Jan 27
- Highland zone 10a, last frost Jan 27
- Rialto zone 10a
- Colton zone 10a, last frost Jan 27
- Hesperia zone 8b, last frost Feb 28
- Loma Linda zone 10a, last frost Jan 27
Questions
What growing zone is Crestline, CA?
Crestline is in USDA Plant Hardiness Zone 8b (average extreme winter low 15°F to 20°F), according to the USDA 2023 map.
When is the last frost in Crestline?
The average last spring frost (32°F) in Crestline is May 5. There is still a 10% chance of frost until May 31.
When can I plant tomatoes in Crestline?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 12 – May 19. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Lake Arrowhead, CA (USC00044671), 9.0 km (5.6 mi) from the city center, elevation 1586 m, based on 11 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.