Alert archive / California / Frost Advisories
Frost Advisories in California, 2023
106 frost advisories in 2023. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of frost advisories reaches back to 2005.
Frost Advisories by county
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Frost Advisories
- 106
- Busiest month
- March17 frost advisories
- Busiest day
- April 4, 20235 frost advisories
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 17, 1:49 PM PST | Frost Advisory | LOX | Los Angeles, Ventura | 6 hr |
| Jan 17, 7:53 PM PST | Frost Advisory | LOX | Santa Barbara | 13 hr |
| Jan 17, 10:49 PM PST | Frost Advisory | SGX | Riverside, San Bernardino | 9 hr |
| Jan 19, 2:06 PM PST | Frost Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 18 hr |
| Jan 20, 2:45 AM PST | Frost Advisory | SGX | Riverside, San Bernardino | 29 hr |
| Jan 20, 1:11 PM PST | Frost Advisory | LOX | San Luis Obispo, Santa Barbara, Ventura | 19 hr |
| Jan 21, 2:10 PM PST | Frost Advisory | LOX | San Luis Obispo, Santa Barbara, Ventura | 18 hr |
| Jan 23, 12:27 PM PST | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 20 hr |
| Jan 23, 2:18 PM PST | Frost Advisory | LOX | San Luis Obispo, Santa Barbara, Ventura | 18 hr |
| Jan 24, 9:44 PM PST | Frost Advisory | LOX | San Luis Obispo, Santa Barbara, Ventura | 11 hr |
| Jan 28, 12:47 PM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 44 hr |
| Jan 30, 4:13 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 29 hr |
| Jan 30, 1:57 PM PST | Frost Advisory | LOX | San Luis Obispo, Santa Barbara, Ventura | 18 hr |
| Jan 31, 2:03 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 31 hr |
| Jan 31, 12:59 PM PST | Frost Advisory | SGX | Riverside, San Bernardino | 19 hr |
| Jan 31, 2:07 PM PST | Frost Advisory | LOX | San Luis Obispo, Santa Barbara, Ventura | 18 hr |
| Feb 1, 2:23 PM PST | Frost Advisory | LOX | San Luis Obispo, Santa Barbara, Ventura | 18 hr |
| Feb 5, 7:18 PM PST | Frost Advisory | MTR | Marin, Napa, Sonoma | 14 hr |
| Feb 11, 5:56 PM PST | Frost Advisory | LOX | Ventura | 14 hr |
| Feb 14, 2:25 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Mateo and 3 more | 31 hr |
| Feb 14, 2:41 AM PST | Frost Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 30 hr |
| Feb 14, 2:41 AM PST | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 29 hr |
| Feb 15, 3:24 AM PST | Frost Advisory | SGX | San Diego | 29 hr |
| Feb 15, 9:02 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 24 hr |
| Feb 15, 2:09 PM PST | Frost Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 18 hr |
| Feb 16, 5:46 PM PST | Frost Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 14 hr |
| Feb 21, 2:42 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, San Benito, City and County of San Francisco and 4 more | 54 hr |
| Feb 21, 1:17 PM PST | Frost Advisory | MTR | Marin, Napa, Sonoma | 20 hr |
| Feb 23, 3:35 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, San Benito, City and County of San Francisco and 4 more | 24 hr |
| Feb 24, 3:08 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 27 hr |
| Feb 25, 8:46 PM PST | Frost Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 12 hr |
| Feb 28, 1:09 PM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, San Benito, San Mateo and 3 more | 19 hr |
| Mar 1, 12:07 PM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, San Benito, City and County of San Francisco and 4 more | 21 hr |
| Mar 1, 12:49 PM PST | Frost Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 20 hr |
| Mar 1, 1:29 PM PST | Frost Advisory | SGX | Orange, San Diego | 19 hr |
| Mar 2, 1:15 PM PST | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 19 hr |
| Mar 2, 1:52 PM PST | Frost Advisory | LOX | Los Angeles, Santa Barbara, Ventura | 18 hr |
| Mar 15, 1:12 PM PDT | Frost Advisory | MTR | Marin, Napa, San Mateo, Santa Clara, Santa Cruz, Sonoma | 20 hr |
| Mar 16, 9:37 PM PDT | Frost Advisory | EKA | Mendocino | 11 hr |
| Mar 17, 2:04 PM PDT | Frost Advisory | EKA | Lake, Mendocino | 19 hr |
| Mar 20, 2:27 PM PDT | Frost Advisory | EKA | Lake, Mendocino | 16 hr |
| Mar 22, 12:42 PM PDT | Frost Advisory | STO | 5 days | |
| Mar 23, 2:12 AM PDT | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more | 4 days |
| Mar 23, 3:54 AM PDT | Frost Advisory | EKA | Mendocino | 29 hr |
| Mar 24, 2:53 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt | 18 hr |
| Mar 26, 2:28 AM PDT | Frost Advisory | LOX | Santa Barbara, Ventura | 31 hr |
| Mar 29, 2:05 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt | 8 hr |
| Mar 29, 8:39 PM PDT | Frost Advisory | MTR | Marin, Napa, Sonoma | 12 hr |
| Mar 30, 10:56 AM PDT | Frost Advisory | EKA | Mendocino | 22 hr |
| Apr 2, 1:54 PM PDT | Frost Advisory | STO | 19 hr | |
| Apr 2, 1:54 PM PDT | Frost Advisory | STO | 43 hr | |
| Apr 3, 2:09 AM PDT | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 30 hr |
| Apr 3, 1:11 PM PDT | Frost Advisory | LOX | Los Angeles, San Luis Obispo, Santa Barbara, Ventura | 19 hr |
| Apr 3, 7:39 PM PDT | Frost Advisory | EKA | Mendocino | 13 hr |
| Apr 4, 12:43 PM PDT | Frost Advisory | SGX | Riverside, San Bernardino, San Diego | 19 hr |
| Apr 4, 2:08 PM PDT | Frost Advisory | EKA | Humboldt, Mendocino | 19 hr |
| Apr 4, 2:22 PM PDT | Frost Advisory | MTR | Marin, Napa, Sonoma | 18 hr |
| Apr 4, 2:25 PM PDT | Frost Advisory | STO | 19 hr | |
| Apr 4, 7:38 PM PDT | Frost Advisory | LOX | Los Angeles, San Luis Obispo, Ventura | 12 hr |
| Apr 11, 2:22 PM PDT | Frost Advisory | EKA | Mendocino | 19 hr |
| Apr 12, 2:03 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 19 hr |
| Apr 13, 2:00 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 19 hr |
| Apr 15, 2:55 PM PDT | Frost Advisory | EKA | Mendocino | 18 hr |
| Apr 19, 3:10 AM PDT | Frost Advisory | EKA | Lake, Mendocino | 6 hr |
| Apr 19, 1:02 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 20 hr |
| May 6, 3:16 AM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 29 hr |
| May 8, 2:27 AM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 30 hr |
| May 9, 2:40 PM PDT | Frost Advisory | EKA | Humboldt, Lake, Mendocino, Trinity | 17 hr |
| Jun 14, 5:41 PM PDT | Frost Advisory | MFR | Modoc, Siskiyou | 14 hr |
| Jun 18, 2:50 PM PDT | Frost Advisory | EKA | Humboldt, Lake, Mendocino, Trinity | 17 hr |
| Jun 19, 12:01 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 20 hr |
| Jun 20, 2:11 PM PDT | Frost Advisory | EKA | Humboldt, Trinity | 19 hr |
| Sep 19, 9:33 PM PDT | Frost Advisory | MFR | Modoc, Siskiyou | 11 hr |
| Sep 20, 1:19 PM PDT | Frost Advisory | MFR | Siskiyou | 20 hr |
| Sep 21, 5:03 PM PDT | Frost Advisory | MFR | Siskiyou | 15 hr |
| Sep 30, 2:15 AM PDT | Frost Advisory | EKA | Humboldt, Lake, Mendocino, Trinity | 24 hr |
| Oct 11, 3:31 AM PDT | Frost Advisory | EKA | Humboldt, Lake, Mendocino, Trinity | 30 hr |
| Oct 25, 2:17 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 20 hr |
| Oct 26, 2:04 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 20 hr |
| Oct 27, 1:25 AM PDT | Frost Advisory | MTR | Marin, Napa, Sonoma | 32 hr |
| Oct 27, 2:13 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 20 hr |
| Oct 28, 6:05 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 15 hr |
| Oct 29, 12:50 PM PDT | Frost Advisory | LOX | Santa Barbara | 19 hr |
| Oct 29, 1:20 PM PDT | Frost Advisory | SGX | San Bernardino | 19 hr |
| Oct 29, 8:59 PM PDT | Frost Advisory | EKA | Humboldt, Mendocino | 12 hr |
| Oct 30, 5:26 AM PDT | Frost Advisory | LOX | Santa Barbara, Ventura | 27 hr |
| Oct 30, 1:18 PM PDT | Frost Advisory | SGX | San Bernardino | 19 hr |
| Oct 31, 3:04 PM PDT | Frost Advisory | LOX | San Luis Obispo, Santa Barbara | 17 hr |
| Nov 1, 1:36 PM PDT | Frost Advisory | LOX | San Luis Obispo, Santa Barbara | 18 hr |
| Nov 2, 1:08 PM PDT | Frost Advisory | LOX | Los Angeles, San Luis Obispo | 19 hr |
| Nov 7, 4:20 AM PST | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 29 hr |
| Nov 8, 1:47 PM PST | Frost Advisory | LOX | Los Angeles, Santa Barbara | 19 hr |
| Nov 9, 1:21 AM PST | Frost Advisory | MTR | Monterey | 7 hr |
| Nov 9, 2:44 AM PST | Frost Advisory | EKA | Humboldt, Mendocino | 6 hr |
| Nov 10, 2:06 PM PST | Frost Advisory | EKA | Humboldt | 13 hr |
| Nov 19, 3:25 AM PST | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 30 hr |
| Nov 22, 11:32 PM PST | Frost Advisory | MTR | Monterey, San Benito | 34 hr |
| Nov 23, 1:34 PM PST | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 19 hr |
| Nov 24, 12:35 AM PST | Frost Advisory | MTR | Marin, Napa, Sonoma | 33 hr |
| Nov 24, 2:57 PM PST | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 18 hr |
| Nov 24, 11:38 PM PST | Frost Advisory | MTR | Marin, Napa, Sonoma | 33 hr |
| Nov 26, 2:51 AM PST | Frost Advisory | MTR | Marin, Napa, Sonoma | 30 hr |
| Nov 26, 1:59 PM PST | Frost Advisory | EKA | Del Norte | 19 hr |
| Nov 27, 8:52 AM PST | Frost Advisory | MTR | Alameda, Contra Costa, Marin, Napa, Sonoma | 24 hr |
| Dec 7, 4:23 AM PST | Frost Advisory | MTR | Marin, Monterey, Napa, San Benito, Sonoma | 10 hr |
| Dec 9, 12:21 AM PST | Frost Advisory | MTR | Marin, Monterey, Napa, San Benito, Sonoma | 33 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Mendocino County30
- Humboldt County25
- Marin County23
- Sonoma County23
- Santa Barbara County22
- Ventura County20
- Napa County19
- San Luis Obispo County18
- Del Norte County17
- Monterey County15
- San Benito County13
- Los Angeles County12
- Alameda County12
- Contra Costa County12
- San Mateo County12
- Santa Clara County12
- Santa Cruz County12
- San Bernardino County10
- Lake County10
- Riverside County8
- Trinity County8
- San Diego County7
- Siskiyou County4
- City and County of San Francisco3
- Modoc County2
- Orange County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20222024
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.