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