How many chill hours does 99139 get?

99139 averages 790 chill hours per winter, ranging from 580 to 991 across the last 10 years.

What hardiness zone is 99139?

99139 is in USDA hardiness zone 6a.

Location almanac

The short answer

99139 averages 790 chill hours per winter (580–991 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 99139’s chill hours and zone:

Chill and zone requirements are comfortably met in 99139.

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

How many chill hours does 99139 get?: 99139 averages 790 chill hours per winter, ranging from 580 to 991 across the last 10 years.
What hardiness zone is 99139?: 99139 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