Harmony, CA frost dates
Frost is light and occasional here — typically a few cold nights around midwinter (about 3 a year). Cover tender plants when frost is forecast.
How Harmony compares
- In a typical year, frost nights in Harmony fall between January 14 and January 19. In 1 year in 10 the first frost comes as early as December 25, or the last frost as late as February 9.
- Compared with Santa Maria, CA, 79 km away, the last frost here is 16 days earlier than there.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | December 30 |
| 50% (median) | January 19 |
| 10% (safe for tender plants) | February 9 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | December 25 |
| 50% (median) | January 14 |
| 90% (late) | February 8 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Gardening where frost is rare
Harmony, CA only freezes on a few winter nights, so the usual "plant after the last frost" rule doesn't apply. Heat and rainfall decide the seasons instead:
- Cool-season crops (lettuce, broccoli, peas, carrots) grow best from fall through late winter.
- Warm-season crops (tomatoes, peppers, beans, squash) do best planted in late winter to spring, and again in late summer for a fall crop — midsummer heat can stop tomatoes setting fruit.
- Heat lovers (okra, sweet potatoes, melons) can be planted through spring and early summer.
About these dates
Based on 1991–2020 NOAA climate normals for the Morro Bay Fire Dept, CA weather station, 18 km away (elevation 118 ft (36 m)).
Frost dates near Harmony
- Cayucos Jan 19 · Jan 14
- Cambria Feb 13 · Feb 1
- Morro Bay Jan 19 · Jan 14
- Los Osos Jan 19 · Jan 14
- Atascadero Jan 19 · Jan 14
- San Simeon Feb 13 · Feb 1
- Templeton Mar 15 · Nov 10
- Paso Robles Apr 4 · Nov 5
- Bradley Feb 13 · Feb 1
- San Luis Obispo Jan 16 · Dec 25
Frequently asked questions
When is the last frost in Harmony, CA?
The median last spring frost in Harmony, CA is January 19. There is still about a 10% chance of frost after February 9, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Harmony, CA?
The median first fall frost is January 14, with about a 10% chance of frost before December 25.
How long is the growing season in Harmony, CA?
About 360 days between the median last spring frost and first fall frost.
What planting zone is Harmony, CA?
Harmony, CA is in USDA hardiness zone 10a.