How many chill hours does 99109 get?

99109 averages 2053 chill hours per winter, ranging from 1569 to 2466 across the last 10 years.

What hardiness zone is 99109?

99109 is in USDA hardiness zone 6a.

Location almanac

The short answer

99109 averages 2,053 chill hours per winter (1,569–2,466 across 10 years) in USDA zone 6a.

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 99109’s chill hours and zone:

Chill and zone requirements are comfortably met in 99109.

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How many chill hours does 99109 get?: 99109 averages 2053 chill hours per winter, ranging from 1569 to 2466 across the last 10 years.
What hardiness zone is 99109?: 99109 is in USDA hardiness zone 6a.

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