ZIP Code 52556 Hardiness Zones and Climate Data

ZIP Code 52556 - Fairfield Iowa is in 2023 USDA Hardiness Zones 6a (-10°F to -5°F) and 5b (-15°F to -10°F)

Additional Gardening Related Climate Data for ZIP Code 52556 - Fairfield, Iowa

2023 Hardiness Zone:Zone 6a: -10°F to -5°F
Zone 5b: -15°F to -10°F
2012 Hardiness Zone:Zone 5b: -15°F to -10°F
1990 Hardiness Zone:Zone 5a: -20F to -15F
Average First Frost Date:Oct. 11 - Oct. 20
Average Last Frost Date:Apr. 21 - Apr. 30
Koppen-Geiger Climate Zone:Dfa - Humid Continental Hot Summers
Ecoregion:47f - Rolling Loess Prairies
Heat Zone Days: 31 - 45 days Over 86°F

Annual Climate Data for ZIP Code 52556 - Fairfield, IA

JanFebMarAprMayJunJulAugSepOctNovDecAnnual
Avg Min Temp (°F)13192940516065635443301840
Avg Max Temp (°F)32385164748387857766493662
Avg Precip (In.)1.241.232.433.464.593.894.444.13.92.912.51.7436.44

Source Data:

2025 plantmaps.com