How many chill hours does 99686 get?

99686 averages 757 chill hours per winter, ranging from 360 to 937 across the last 10 years.

What hardiness zone is 99686?

99686 is in USDA hardiness zone 5a.

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The short answer

99686 averages 757 chill hours per winter (360–937 across 10 years) in USDA zone 5a.

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 99686’s chill hours and zone:

Chill and zone requirements are comfortably met in 99686.

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Possible in a good year or a favorable microclimate — click through for the caveats.

How many chill hours does 99686 get?: 99686 averages 757 chill hours per winter, ranging from 360 to 937 across the last 10 years.
What hardiness zone is 99686?: 99686 is in USDA hardiness zone 5a.

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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