How many chill hours does 99788 get?

99788 averages 570 chill hours per winter, ranging from 373 to 725 across the last 10 years.

What hardiness zone is 99788?

99788 is in USDA hardiness zone 1a.

Location almanac

The short answer

99788 averages 570 chill hours per winter (373–725 across 10 years) in USDA zone 1a.

99788 climate
Average chill hours	570 (373–725 across 10 winters)
USDA hardiness zone	1a
Last spring frost	typically May 3 – May 26
First fall frost	typically September 8 – September 26

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 99788’s chill hours and zone:

Chill and zone requirements are comfortably met in 99788.

Show 3 more good fit varieties

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

How many chill hours does 99788 get?: 99788 averages 570 chill hours per winter, ranging from 373 to 725 across the last 10 years.
What hardiness zone is 99788?: 99788 is in USDA hardiness zone 1a.

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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