Frost dates for 91021 — Montrose, CA
Frost is light and occasional here — typically a few cold nights around midwinter (about 0 a year). Cover tender plants when frost is forecast.
How Montrose compares
- In a typical year, frost nights in Montrose fall between January 7 and January 8. In 1 year in 10 the first frost comes as early as December 20, or the last frost as late as February 17.
- Compared with Glendale, CA, 7 km away, the last frost here is 6 days later than there.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | December 20 |
| 50% (median) | January 8 |
| 10% (safe for tender plants) | February 17 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | December 20 |
| 50% (median) | January 7 |
| 90% (late) | February 14 |
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
Montrose, 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 Pasadena, CA weather station, 10 km away (elevation 863 ft (263 m)).
ZIP codes in Montrose: 91020 91021
Frost dates near Montrose
- Verdugo City Jan 2 · Dec 26
- La Canada Flintridge Jan 8 · Jan 7
- La Crescenta Jan 2 · Dec 26
- Glendale Jan 2 · Dec 26
- Tujunga Dec 31 · Dec 28
- Altadena Jan 8 · Jan 7
- Burbank Jan 2 · Dec 26
- Pasadena Jan 8 · Jan 7
Frequently asked questions
When is the last frost in Montrose, CA?
The median last spring frost in Montrose, CA is January 8. There is still about a 10% chance of frost after February 17, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Montrose, CA?
The median first fall frost is January 7, with about a 10% chance of frost before December 20.
How long is the growing season in Montrose, CA?
About 364 days between the median last spring frost and first fall frost.
What planting zone is Montrose, CA?
Montrose, CA is in USDA hardiness zone 10a.