All states › Zone 5b
USDA Hardiness Zone 5b
Zone 5b on the 2023 USDA Plant Hardiness Zone Map means an average annual extreme minimum temperature of -15°F to -10°F, averaged over 1991 to 2020. The zone is about the coldest winter night, not frost dates or summer heat, so towns in the same zone can have different frost dates.
Towns in zone 5b
- Fort CollinsZone 5b, median last frost May 2
- Castle RockZone 5b, median last frost May 9
- ParkerZone 5b, median last frost May 9
- NapervilleZone 5b, median last frost Apr 19
- RockfordZone 5b, median last frost Apr 24
- Des MoinesZone 5b, median last frost Apr 18
- Cedar RapidsZone 5b, median last frost Apr 27
- ConcordZone 5b, median last frost May 8
- Saratoga SpringsZone 5b, median last frost May 2
- Rapid CityZone 5b, median last frost May 10
- BurlingtonZone 5b, median last frost Apr 29
- MadisonZone 5b, median last frost May 1
- Green BayZone 5b, median last frost Apr 30
- KenoshaZone 5b, median last frost Apr 19
- AppletonZone 5b, median last frost May 4
- CheyenneZone 5b, median last frost May 12