USDA Hardiness Zones Map

Find your grow zone by state. Click any state to see frost dates, growing season, and plant recommendations.

Hover a state to see its zone · Click to explore

AKAlaska1b–8a HIHawaii9b–13a

Hardiness Zone Legend

Zone 3a Zone 3b Zone 4a Zone 4b Zone 5a Zone 5b Zone 6a Zone 6b Zone 7a Zone 7b Zone 8a Zone 8b Zone 9a Zone 9b Zone 10a Zone 10b Zone 11a Zone 11b

Colder → warmer. Zones vary within states — use ZIP lookup for precise results.

How the map works

Each zone covers a 10°F temperature range, split into "a" (colder half) and "b" (warmer half). A plant labeled "hardy to zone 5" can survive typical winters in zones 5 and warmer.

The 2023 USDA map reflects climate warming — many areas shifted half a zone warmer vs. the 2012 version. Our map shows the most common zone per state — actual zones vary by elevation, proximity to water, and urban heat.

→ Use ZIP lookup for your precise zone

All Zone Guides

Zone 3a

-40°F to -35°F

Frost-free ~90-120 days · Last frost Late May

Zone 3b

-35°F to -30°F

Frost-free ~100-130 days · Last frost Mid-to-late May

Zone 4a

-30°F to -25°F

Frost-free ~110-140 days · Last frost Mid-May

Zone 4b

-25°F to -20°F

Frost-free ~120-150 days · Last frost Early-to-mid May

Zone 5a

-20°F to -15°F

Frost-free ~130-160 days · Last frost Early May

Zone 5b

-15°F to -10°F

Frost-free ~140-170 days · Last frost Late April to early May

Zone 6a

-10°F to -5°F

Frost-free ~150-180 days · Last frost Late April

Zone 6b

Frost-free ~160-190 days · Last frost Mid-April

Zone 7a

Frost-free ~180-220 days · Last frost Early-to-mid April

Zone 7b

Frost-free ~200-240 days · Last frost Early April

Zone 8a

Frost-free ~220-260 days · Last frost Late March

Zone 8b

Frost-free ~240-280 days · Last frost Mid-March

Zone 9a

Frost-free ~270-310 days · Last frost Late February

Zone 9b

Frost-free ~300-340 days · Last frost Mid-February

Zone 10a

Frost-free ~330-360 days · Last frost Late January (rare)

Zone 10b

Frost-free ~360 days · Last frost Essentially none

Zone 11a

Frost-free year-round · Last frost None

Zone 11b

Frost-free year-round · Last frost None

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