Rosamond, CA planting zone & frost dates
Rosamond is in USDA hardiness zone 8b. The last spring frost usually comes around April 3 and the first fall frost around November 1, for a growing season of about 211 days.
Planting calendar for Rosamond
Dates are counted from the average last spring frost (April 3) 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: Feb 6 – Feb 20 Transplant outdoors: Apr 10 – Apr 17 |
| Peppers | Start seeds indoors: Jan 23 – Feb 6 Transplant outdoors: Apr 17 – Apr 24 |
| Eggplant | Start seeds indoors: Jan 23 – Feb 6 Transplant outdoors: Apr 17 – Apr 24 |
| Broccoli | Start seeds indoors: Jan 23 – Feb 6 Transplant outdoors: Mar 6 – Mar 20 |
| Cabbage | Start seeds indoors: Jan 23 – Feb 6 Transplant outdoors: Mar 6 – Mar 20 |
| Onions (sets) | Plant outdoors: Mar 6 – Mar 20 |
| Peas | Sow outdoors: Feb 20 – Mar 6 |
| Spinach | Sow outdoors: Feb 20 – Mar 6 |
| Lettuce | Sow outdoors: Mar 6 – Mar 20 |
| Carrots | Sow outdoors: Mar 6 – Mar 20 |
| Potatoes | Plant outdoors: Mar 6 – Mar 20 |
| Beans | Sow outdoors: Apr 10 – Apr 17 |
| Sweet corn | Sow outdoors: Apr 10 – Apr 17 |
| Cucumbers | Sow outdoors: Apr 10 – Apr 17 |
| Squash & zucchini | Sow outdoors: Apr 10 – Apr 17 |
| Basil | Start seeds indoors: Feb 20 – Mar 6 Transplant outdoors: Apr 10 – Apr 17 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 6 (8 weeks before the average first fall frost on Nov 1).
Useful for zone 8b gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
As an Amazon Associate, FrostZoneMap earns from qualifying purchases, at no extra cost to you.
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Mar 8 | Apr 3 | Apr 23 |
| First 32°F frost in fall is before | Nov 14 | Nov 1 | Oct 17 |
How to read it: in spring there is a 10% chance of a frost after April 23, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 17. A hard freeze (28°F) usually ends around March 8.
Hardiness zone by ZIP code in Rosamond
- 93560 zone 8b
Nearby cities
- Lancaster zone 8b, last frost Apr 3
- Quartz Hill zone 9a, last frost Apr 3
- Palmdale zone 8b, last frost Mar 10
- California City zone 8b, last frost Mar 15
- Vincent zone 8b, last frost Mar 10
- Sun Village zone 8b, last frost Mar 13
- Tehachapi zone 8b, last frost Apr 28
- Lake Los Angeles zone 8b, last frost Mar 13
Questions
What growing zone is Rosamond, CA?
Rosamond 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 Rosamond?
The average last spring frost (32°F) in Rosamond is April 3. There is still a 10% chance of frost until April 23.
When can I plant tomatoes in Rosamond?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 10 – Apr 17. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Lancaster Wm J Fox Fld, CA (USW00003159), 14.4 km (8.9 mi) from the city center, elevation 713 m, based on 27 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.