USDA Hardiness Zones for Plants

Part of the Roses For Dummies Cheat Sheet

If you live in a cold-winter area, choose roses that can survive with minimum damage. This plant hardiness zone chart (based on average annual minimum temperatures) is from the USDA; it helps you figure how cold it gets in your area. Choose roses suitable for your climate zone.

Temperature in ° C USDA Zone Temperature in ° F
–45.6 and below 1 Below –50
–42.8 and below 2a –45 to –50
–40 to –42.7 2b –40 to –45
–37.3 to –39.9 3a –35 to –40
–34.5 to –37.2 3b –30 to –35
–31.7 to –34.4 4a –25 to –30
–28.9 to –31.6 4b –20 to –25
–26.2 to –28.8 5a –15 to –20
–23.4 to –26.1 5b –10 to –15
–20.6 to –23.3 6a –5 to –10
–17.8 to –20.5 6b 0 to –5
–15 to –17.7 7a 5 to 0
–12.3 to –14.9 7b 10 to 5
–9.5 to –12.2 8a 15 to 10
–6.7 to –9.4 8b 20 to 15
–3.9 to –6.6 9a 25 to 20
–1.2 to –3.8 9b 30 to 25
1.6 to –1.1 10a 35 to 30
4.4 to 1.7 10b 40 to 35
4.5 and above 11 40 and above
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