Lyon County, Iowa · Frost dates
Lyon County frost dates.
First-frost, last-frost, and growing-season length for Lyon County, Iowa. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 5a
32°F — light freeze
Last spring frost
- 10%
- 05-13
- 20%
- 05-09
- 50%
- 05-01
- 80%
- 04-22
- 90%
- 04-18
First fall frost
- 10%
- 09-21
- 20%
- 09-26
- 50%
- 10-04
- 80%
- 10-15
- 90%
- 10-19
28°F — killing freeze
Last spring freeze
- 10%
- 05-04
- 20%
- 05-01
- 50%
- 04-21
- 80%
- 04-12
- 90%
- 04-07
First fall freeze
- 10%
- 10-01
- 20%
- 10-05
- 50%
- 10-16
- 80%
- 10-24
- 90%
- 10-27
Growing season length (days, 28°F threshold)
- Short year
- 150
- Median
- 178
- Long year
- 203
Source NOAA station
ROCK RAPIDS, IA US
3.7 mi · 30 yrs of record (1991–2020) · 1350 ft elev.
Data from ROCK RAPIDS, IA US, 3.7 miles away with 30-year NOAA record (1991-2020).
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