Frost dates in Glendale, California
NOAA 1991–2020 normals for a 32 °F freeze. Low spots and the edge of town run colder than downtown.
Short answer
The average last spring frost in Glendale is December 31, and the average first fall frost is December 28, from NOAA's Burbank Glendale Pasadena Airport station, 7 miles from the middle of Glendale. 1 year in 10 the last frost comes after January 15, and the first one by December 11. That leaves about 362 frost-free days. Glendale is in USDA planting zone 10a.
Weather stations around Glendale
The first row is the date most people in Glendale go by. The others show how far the dates move across the area.
| Station | Last spring frost | First fall frost | Frost-free |
|---|---|---|---|
| Burbank Glendale Pasadena Airport 7 mi away, 741 ft | December 31 1 in 10 after January 15 | December 28 1 in 10 by December 11 | 362 days |
| Burbank Valley Pump Plt 6 mi away, 655 ft | January 2 1 in 10 after January 31 | December 26 1 in 10 by December 5 | 358 days |
| Pasadena 6 mi away, 864 ft | January 8 1 in 10 after February 17 | January 7 1 in 10 by December 20 | 364 days |
| Los Angeles Dwtn Usc Campus 9 mi away, 230 ft | Frost too rare to date (32 °F in under 1 year in 10) | ||
| Mt Wilson Cbs 11 mi away, 5,710 ft | April 28 1 in 10 after May 27 | November 15 1 in 10 by October 18 | 201 days |
Distances are from the middle of Glendale as the Census Bureau maps it. The average date is NOAA's 50% date: half of years have a later last frost, or an earlier first one. Plan by the 1-in-10 date if a freeze would cost you plants. The planting zone is the USDA 2023 zone for ZIP code 91208, at the middle of the city.
Your exact ZIP code
Glendale covers a lot of ground. For the station nearest your own street, and its planting zone, type your ZIP code.
How these dates work
Frost dates come from NOAA's 1991 to 2020 Climate Normals, which work out from each weather station's daily lows how likely the last spring freeze and the first fall freeze (32 °F) are by each date. We use the station nearest the middle of your ZIP code and show its height and distance, since a station on a hill or by a lake can differ from your yard.
The average date is the 50% date: half of years have a freeze after the spring date or before the fall one. The 1-in-10 dates are NOAA's 10% dates, the ones to plan by if a late freeze would cost you plants. Within one yard, cold air pools in low spots while walls and paving hold heat, so some corners freeze before others.
More frost dates
All of California, station by station.
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Where the numbers come from
- USDA Plant Hardiness Zone Map, 2023. Agricultural Research Service, U.S. Department of Agriculture
- PRISM Climate Group, Oregon State University (zone data)
- NOAA NCEI, U.S. Climate Normals 1991–2020, annual/seasonal
- NOAA, Normals calculation methodology (frost-freeze probability dates)
- US Census Bureau, 2025 ZCTA gazetteer (ZIP code centers)
- US Census Bureau, 2025 city population estimates and place gazetteer