Frost dates and growing zones in Iowa

3 town pages so far. Zones from the 2023 USDA Plant Hardiness Zone Map, frost dates from NOAA 1991-2020 normals at the nearest weather station.

Towns covered so far in Iowa fall in USDA zones 5a, 5b. Median dates mean frost comes later (spring) or earlier (fall) in half of years.

Towns

Town	Zone	Median last frost	Median first frost
Des Moines	5b	Apr 18	Oct 20
Cedar Rapids	5b	Apr 27	Oct 11
Waterloo	5a	Apr 27	Oct 10