Frost dates for Kent, Washington
Washington · first & last freeze, from NOAA 1991–2020 climate normals
In a typical year, the last spring freeze around Kent comes near March 20 and the first fall freeze near November 10. One year in ten, a freeze still arrives after April 8 in spring — and one year in ten, the first fall freeze has already landed by October 26. NCEI's own growing-season statistic (days between freezes, percentiled per year) puts the median at 233 days.
Freeze-date probabilities, three thresholds
| Threshold | Last spring — 9 in 10 years past by | Last spring — typical (median) | Last spring — 1 in 10 years later than | First fall — 1 in 10 years by | First fall — typical (median) | First fall — 9 in 10 years by |
|---|---|---|---|---|---|---|
| 36°F — near-freezing (frost can occur) | March 26 | April 11 | April 30 | October 13 | October 27 | November 11 |
| 32°F — freezing | February 27 | March 20 | April 8 | October 26 | November 10 | November 26 |
| 28°F — hard freeze | January 19 | February 25 | March 16 | November 6 | November 24 | December 20 |
Measured at Kent, WA (USC00454169), 2.5 mi from the city's census reference point, elev. 30 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) | Opens | Closes | Length |
|---|---|---|---|
| Cautious (1-in-10 freeze risk at each end) | April 8 | October 26 | 201 days |
| Typical (median freeze dates) | March 20 | November 10 | 235 days |
| Gambler's (9-in-10 freeze risk at each end) | February 27 | November 26 | 272 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
- Census entity: Kent city, Washington — official 2024 population estimate 136,588.
- Weather station: Kent, WA (USC00454169), 2.5 mi from the city's census-gazetteer reference point at elevation 30 ft. Frost dates are that station's history — neighborhoods vary.
- Data pulled 2026-09-05; normals period 1991-2020 (replaced by NOAA roughly once a decade).
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