How many chill hours does 99770 get?

99770 averages 716 chill hours per winter, ranging from 493 to 841 across the last 10 years.

What hardiness zone is 99770?

99770 is in USDA hardiness zone 2a.

Location almanac

The short answer

99770 averages 716 chill hours per winter (493–841 across 10 years) in USDA zone 2a.

99770 climate
Average chill hours	716 (493–841 across 10 winters)
USDA hardiness zone	2a
Last spring frost	typically May 8 – June 4
First fall frost	typically September 17 – September 28

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 99770’s chill hours and zone:

Chill and zone requirements are comfortably met in 99770.

Show 11 more good fit varieties

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

How many chill hours does 99770 get?: 99770 averages 716 chill hours per winter, ranging from 493 to 841 across the last 10 years.
What hardiness zone is 99770?: 99770 is in USDA hardiness zone 2a.

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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