How many chill hours does 99751 get?

99751 averages 677 chill hours per winter, ranging from 446 to 886 across the last 10 years.

What hardiness zone is 99751?

99751 is in USDA hardiness zone 1b.

Location almanac

The short answer

99751 averages 677 chill hours per winter (446–886 across 10 years) in USDA zone 1b.

99751 climate
Average chill hours	677 (446–886 across 10 winters)
USDA hardiness zone	1b
Last spring frost	typically May 7 – May 27
First fall frost	typically September 6 – September 27

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 99751’s chill hours and zone:

Chill and zone requirements are comfortably met in 99751.

Show 6 more good fit varieties

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

How many chill hours does 99751 get?: 99751 averages 677 chill hours per winter, ranging from 446 to 886 across the last 10 years.
What hardiness zone is 99751?: 99751 is in USDA hardiness zone 1b.

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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