All states › Zone 6a
USDA Hardiness Zone 6a
Zone 6a on the 2023 USDA Plant Hardiness Zone Map means an average annual extreme minimum temperature of -10°F to -5°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 6a
- FlagstaffZone 6a, median last frost Jun 4
- DenverZone 6a, median last frost May 4
- Colorado SpringsZone 6a, median last frost May 3
- AuroraZone 6a, median last frost May 4
- ArvadaZone 6a, median last frost May 5
- BoulderZone 6a, median last frost May 6
- BroomfieldZone 6a, median last frost May 2
- GoldenZone 6a, median last frost May 5
- DurangoZone 6a, median last frost May 21
- PocatelloZone 6a, median last frost May 16
- ChicagoZone 6a, median last frost Apr 10
- SpringfieldZone 6a, median last frost Apr 14
- PeoriaZone 6a, median last frost Apr 16
- ChampaignZone 6a, median last frost Apr 15
- DecaturZone 6a, median last frost Apr 14
- Fort WayneZone 6a, median last frost Apr 24
- LafayetteZone 6a, median last frost Apr 26
- GreenwoodZone 6a, median last frost Apr 15
- ValparaisoZone 6a, median last frost Apr 29
- PortlandZone 6a, median last frost Apr 26
- WorcesterZone 6a, median last frost Apr 23
- SpringfieldZone 6a, median last frost Apr 21
- Grand RapidsZone 6a, median last frost Apr 29
- Ann ArborZone 6a, median last frost May 3
- LansingZone 6a, median last frost May 1
- FlintZone 6a, median last frost May 6
- SaginawZone 6a, median last frost Apr 29
- JacksonZone 6a, median last frost May 1
- OmahaZone 6a, median last frost Apr 18
- LincolnZone 6a, median last frost Apr 24
- ManchesterZone 6a, median last frost Apr 30
- DoverZone 6a, median last frost May 8
- SyracuseZone 6a, median last frost Apr 29
- AlbanyZone 6a, median last frost Apr 27
- SchenectadyZone 6a, median last frost Apr 27
- BinghamtonZone 6a, median last frost May 2
- YoungstownZone 6a, median last frost May 1
- SpringfieldZone 6a, median last frost Apr 25
- MansfieldZone 6a, median last frost Apr 26
- LoganZone 6a, median last frost May 8
- MilwaukeeZone 6a, median last frost Apr 26