How many chill hours does 99603 get?

99603 averages 2332 chill hours per winter, ranging from 1601 to 3085 across the last 10 years.

What hardiness zone is 99603?

99603 is in USDA hardiness zone 6a.

Location almanac

The short answer

99603 averages 2,332 chill hours per winter (1,601–3,085 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 99603’s chill hours and zone:

Chill and zone requirements are comfortably met in 99603.

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How many chill hours does 99603 get?: 99603 averages 2332 chill hours per winter, ranging from 1601 to 3085 across the last 10 years.
What hardiness zone is 99603?: 99603 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