Belgium Wwtp, WI: frost dates by year

Last spring and first fall frost at NOAA station USC00470652, 2010 to 2025, measured from daily minimum temperatures.

Elevation 731 ft, 43.513, -87.855. Download the data (JSON), NOAA daily records

Summary at 32°F

	Last spring frost	First fall frost
Median	May 1	Oct 17
Earliest	Apr 20 (2019)	Sep 19 (2012)
Latest	May 19 (2023)	Oct 26 (2017)
Trend	9.0 days later per decade	little change (less than half a day per decade)
Years with data	15	16

At 28°F (hard freeze) the median last spring date is Apr 23 and the median first fall date is Oct 27.

The trend is a straight-line fit through the years with a freeze. A positive spring trend means the last frost now comes later. Short or patchy records give noisy trends.

Chart

Last spring frost (32°F)

First fall frost (32°F)

Dots are single years. The gray line is the median, the green line the fitted trend.

Year by year

Year	Last spring 32°F	First fall 32°F	Last spring 28°F	First fall 28°F
2025	May 9	Oct 24	Apr 9	Oct 24
2024	Apr 25	Oct 16	Apr 25	Nov 2
2023	May 19	Oct 9	Apr 24	Oct 30
2022	May 6	Oct 8	Apr 28	Oct 27
2021	May 12	Oct 24	Apr 22	Nov 2
2020	May 14	Oct 5	May 9	Oct 17
2019	Apr 20	Oct 14	Apr 16	Oct 26
2018	Apr 30	Sep 30	Apr 30	Oct 13
2017	May 9	Oct 26	Apr 1	Nov 2
2016	May 15	Oct 14	Apr 10	Nov 12
2015	May 1	Oct 17	Apr 24	Oct 17
2014	Apr 23	Oct 19	Apr 23	Oct 21
2013	no data	Oct 20	no data	Oct 23
2012	Apr 29	Sep 19	Apr 27	Oct 12
2011	Apr 21	Oct 23	Apr 1	Oct 29
2010	Apr 28	Oct 22	Apr 10	Oct 29

"none" means the station recorded no freeze at that threshold in that half of the year. "no data" means more than 10% of the season's daily readings were missing. Years with no usable data are left out. See the methodology for the rules, and the ZIP lookup for 1991 to 2020 frost probabilities.