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Chill hours in 05902

The short answer

05902 averages 1,200 chill hours per winter (9361,650 across 10 years) in USDA zone 4a.
05902 climate
Average chill hours1,200 (936–1,650 across 10 winters)
USDA hardiness zone4a
Last spring frosttypically May 9 – May 18
First fall frosttypically October 3 – October 23

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 05902’s chill hours and zone:

How many chill hours does 05902 get?
05902 averages 1200 chill hours per winter, ranging from 936 to 1650 across the last 10 years.
What hardiness zone is 05902?
05902 is in USDA hardiness zone 4a.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026