Growing zone for 59804
Growing conditions
- USDA hardiness zone
- 5b
- Avg. minimum winter temp
- -15°F
- Median frost dates
- First ~Sep 26 · Last ~May 16
Frost dates: NOAA 1991–2020 Climate Normals, nearest station (MISSOULA INTL AP, MT US, 7.4 km away) .
Planting windows and crop timing here are computed from USDA/NOAA climate data and the university extension sources cited below, not a site visit or soil test. Treat this as a starting point: local conditions vary, and a local nursery or extension office can advise on your exact site. See our full Disclaimer.
Frost-free growing season: about 133 days (last frost to first frost).
What grows in zone 5b, and when →
What to plant this month (September) →