Last frost date in Glendora, California
January 8
Average last frost in spring. In an early year (1 in 10) it's over by December 14; in a late year (1 in 10) it comes after February 18.
December 28
Average first frost in fall. 1 year in 10 it comes by December 5.
A 32°F night happens here about 7 years in 10; in those years these are the usual dates.
Source: NOAA U.S. Climate Normals 1991–2020, station Pomona/fairplex (USC00047050), 6.4 miles from Glendora, elevation 999 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Dec 14 | Jan 8 | Feb 18 |
| First frost in fall | Dec 5 | Dec 28 | Feb 2 |
An early or late year is one in 10: 1 year in 10 the frost comes before the early date, and 1 year in 10 after the late date.
Frost-free days in an average year: 354
Planting calendar for Glendora
Fall planting
USDA dates for places whose average first freeze is about December 20 (Glendora: December 28).
- SoybeansJune 1 – July 30 (past for this year)
- Summer squashJune 1 – Oct 1 (past for this year)
- Sweet potatoesJune 1 – July 1 (past for this year)
- Swiss chardJune 1 – Dec 31Now
- Black-eyed peasJuly 1 – Sept 20 (past for this year)
- Eggplant plantsAug 1 – Sept 30 (past for this year)
- OkraAug 1 – Oct 1 (past for this year)
- PotatoesAug 1 – Sept 15 (past for this year)
- Winter squashAug 1 – Sept 1 (past for this year)
- CucumbersAug 15 – Oct 1 (past for this year)
- Peppers plantsAug 15 – Oct 1 (past for this year)
- Witloof chicoryAug 15 – Oct 15 (past for this year)
- BeetsSept 1 – Dec 31Now
- Broccoli plantsSept 1 – Dec 31Now
- Brussels sprouts plantsSept 1 – Dec 31Now
- Cabbage plantsSept 1 – Dec 31Now
- Chinese cabbageSept 1 – Dec 1Now
- Collards plantsSept 1 – Dec 31Now
- EndiveSept 1 – Dec 31Now
- Florence fennelSept 1 – Dec 1Now
- KaleSept 1 – Dec 31Now
- KohlrabiSept 1 – Dec 31Now
- Lima beansSept 1 – Oct 1 (past for this year)
- ParsleySept 1 – Dec 31Now
- ParsnipsSept 1 – Dec 1Now
- SalsifySept 1 – Oct 31Now
- Snap beansSept 1 – Nov 1Now
- SorrelSept 1 – Dec 31Now
- TomatoesSept 1 – Nov 1Now
- CarrotsSept 15 – Dec 1Now
- Cauliflower plantsSept 15 – Nov 1Now
- GarlicSept 15 – Nov 15Now
- Head lettuce plantsSept 15 – Dec 31Now
- Leaf lettuceSept 15 – Dec 31Now
- LeeksSept 15 – Nov 1Now
- Mustard greensSept 15 – Dec 1Now
- Onion seedSept 15 – Nov 1Now
- ShallotsSept 15 – Nov 1Now
- Celery and celeriac plantsOct 1 – Dec 31Now
- Corn saladOct 1 – Dec 31Now
- DandelionOct 1 – Dec 31Now
- Garden peasOct 1 – Dec 31Now
- Onion plants plantsOct 1 – Dec 31Now
- RadishesOct 1 – Dec 31Now
- SpinachOct 1 – Dec 31Now
- TurnipsOct 1 – Dec 31Now
- Upland cressOct 1 – Dec 31Now
- RutabagaOct 15 – Nov 15Now
- Chervil and chivesNov 1 – Dec 31Soon
- Onion setsNov 1 – Dec 31Soon
USDA lists horseradish as generally spring-planted here.
Spring planting
Glendora's average last frost falls outside the dates USDA's planting table covers, so we don't give spring planting dates here.
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5 (earliest safe spring and latest safe fall dates), applied to this place's NOAA frost dates. “Plants” means setting out transplants, not sowing seed. How we match the table.