Harman US

Frost Dates for Fremont, CA

Last spring frost
Jan 7
First fall frost
Dec 22
Growing season
353 days
Hardiness zone
9b

In an average year around Fremont, CA, the last spring frost (32°F) is about Jan 7 and the first fall frost is about Dec 22, giving roughly a 353-day growing season. To be safe most years, wait until Dec 14 before setting out tender plants.

Last spring frost

Dates the last frost of spring typically ends. Plant tender crops after the risk has passed for your comfort level.

Last spring frost - Fremont, CA
Frost intensity Early (10%) Average (50%) Late (90%)
Light (36°F) Mar 11 Feb 6 Jan 3
Freeze (32°F) Feb 7 Jan 7 Dec 14
Hard (28°F) Jan 20 Dec 31 Dec 13
Show full probability table (all thresholds & percentiles)
°F 10% 20% 30% 40% 50% 60% 70% 80% 90%
36°F Mar 11 Mar 1 Feb 24 Feb 14 Feb 6 Jan 31 Jan 25 Jan 16 Jan 3
32°F Feb 7 Jan 29 Jan 22 Jan 13 Jan 7 Jan 2 Dec 29 Dec 23 Dec 14
28°F Jan 20 Jan 13 Jan 7 Jan 2 Dec 31 Dec 29 Dec 25 Dec 20 Dec 13

First fall frost

Dates the first frost of fall typically arrives. Count back by a crop's days-to-maturity to know your planting cutoff.

First fall frost - Fremont, CA
Frost intensity Early (10%) Average (50%) Late (90%)
Light (36°F) Nov 17 Dec 5 Jan 2
Freeze (32°F) Dec 2 Dec 22 Jan 21
Hard (28°F) Dec 11 Dec 29 Jan 17
Show full probability table (all thresholds & percentiles)
°F 10% 20% 30% 40% 50% 60% 70% 80% 90%
36°F Nov 17 Nov 24 Nov 30 Dec 2 Dec 5 Dec 9 Dec 13 Dec 21 Jan 2
32°F Dec 2 Dec 7 Dec 12 Dec 16 Dec 22 Dec 27 Jan 1 Jan 7 Jan 21
28°F Dec 11 Dec 18 Dec 21 Dec 26 Dec 29 Jan 1 Jan 5 Jan 9 Jan 17

Growing season is measured at 32°F with about 50% probability. Hardiness zone from the 2023 USDA map; frost normals from NOAA 1991-2020.

Where this data comes from

These dates are computed from the nearest official weather station with long-term records: Fremont, Ca, about 2.7 miles away@if(!empty($station['elevation_ft'])), at 38 ft elevation. The further the station and the greater the elevation difference from your yard, the more your local frost timing can vary.

@endif
How we calculate these dates

Frost and freeze dates come from the NOAA 1991–2020 U.S. Climate Normals, the National Oceanic and Atmospheric Administration's 30-year averages for each weather station. A date shown at the 50% level is the median: in half of years the frost falls on or before it. The 10% and 90% columns show the early and late ends of the range, so you can plant on the odds you're comfortable with. These are long-term averages, not a forecast for this year - always check your local outlook before planting.

Source: NOAA National Centers for Environmental Information, 1991–2020 Climate Normals (public domain). Harman is not affiliated with or endorsed by NOAA.

Frequently asked questions

When is the last frost in Fremont, CA?

On average, the last spring frost (32°F) around Fremont, CA is about Jan 7. In cooler years it can run later, so for a safer bet many gardeners wait until Dec 14.

When is the first frost in the fall?

The first fall frost around Fremont, CA typically arrives about Dec 22. Count back by a crop's days to maturity to find the latest date you can plant it.

When can I plant tomatoes and other tender crops?

Tender crops like tomatoes, peppers and basil are damaged by frost, so wait until the last spring frost has passed - around Jan 7 on average, or Dec 14 to be safe most years.

How long is the growing season here?

The frost-free growing season (between the last spring and first fall 32°F frost) is about 353 days in a typical year.

Are these dates a forecast for this year?

No. They are 30-year averages from the NOAA 1991–2020 Climate Normals, not a prediction for the current year. Use them for planning and always check your local weather forecast before planting or protecting crops.

Local weather for 94536 Planting calendar → California frost dates →

Data source: NOAA 1991–2020 Climate Normals · Page updated Aug 4, 2026