Frost Dates
Frost Dates · California

Frost dates for Roseville, California

California · first & last freeze, from NOAA 1991–2020 climate normals

Typical last spring freeze (32°F)
February 22
median date, 1991–2020
Typical first fall freeze (32°F)
November 24
median date, 1991–2020
Typical frost-free season
275 days
between the median dates

In a typical year, the last spring freeze around Roseville comes near February 22 and the first fall freeze near November 24. One year in ten, a freeze still arrives after April 1 in spring — and one year in ten, the first fall freeze has already landed by November 9. NCEI's own growing-season statistic (days between freezes, percentiled per year) puts the median at 277 days.

JFMAMJJASONDFebruary 22November 24
The year at a glance: blue bands span the 9-in-10 to 1-in-10 range where the last spring / first fall 32°F freeze lands; the green band is the typical frost-free window between the median dates. Measured at Sacramento Metro Ap, CA (USW00093225), 15.5 mi from the city's census reference point, elev. 23 ft. NOAA/NCEI 1991–2020 normals.

Freeze-date probabilities, three thresholds

ThresholdLast spring — 9 in 10 years past byLast spring — typical (median)Last spring — 1 in 10 years later thanFirst fall — 1 in 10 years byFirst fall — typical (median)First fall — 9 in 10 years by
36°F — near-freezing (frost can occur)March 2April 1April 22October 24November 10November 25
32°F — freezingJanuary 10February 22April 1November 9November 24December 21
28°F — hard freezeDecember 17January 17February 19November 21December 10January 18

Measured at Sacramento Metro Ap, CA (USW00093225), 15.5 mi from the city's census reference point, elev. 23 ft. NOAA/NCEI 1991–2020 normals. Read each date column as odds over the 30-year record — e.g. "9 in 10 years past by" means only one spring in ten saw a later freeze than that date.

Frost-free windows (computed)

Window (32°F ends)OpensClosesLength
Cautious (1-in-10 freeze risk at each end)April 1November 9222 days
Typical (median freeze dates)February 22November 24275 days
Gambler's (9-in-10 freeze risk at each end)January 10December 21345 days

Pure arithmetic on the freeze-date percentiles above — the "cautious" window opens on the date only 1 year in 10 still sees a later spring freeze, and closes on the date by which only 1 year in 10 has already frozen.

About this city's numbers

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