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Chill hours in 99736

The short answer

99736 averages 942 chill hours per winter (7501,094 across 10 years) in USDA zone 3a.
99736 climate
Average chill hours942 (750–1,094 across 10 winters)
USDA hardiness zone3a
Last spring frosttypically May 10 – June 5
First fall frosttypically September 21 – October 12

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 99736’s chill hours and zone:

How many chill hours does 99736 get?
99736 averages 942 chill hours per winter, ranging from 750 to 1094 across the last 10 years.
What hardiness zone is 99736?
99736 is in USDA hardiness zone 3a.

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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