How many chill hours does 99555 get?

99555 averages 1446 chill hours per winter, ranging from 877 to 2050 across the last 10 years.

What hardiness zone is 99555?

99555 is in USDA hardiness zone 4b.

Location almanac

The short answer

99555 averages 1,446 chill hours per winter (877–2,050 across 10 years) in USDA zone 4b.

99555 climate
Average chill hours	1,446 (877–2,050 across 10 winters)
USDA hardiness zone	4b
Last spring frost	typically May 3 – May 18
First fall frost	typically September 23 – October 16

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 99555’s chill hours and zone:

Chill and zone requirements are comfortably met in 99555.

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How many chill hours does 99555 get?: 99555 averages 1446 chill hours per winter, ranging from 877 to 2050 across the last 10 years.
What hardiness zone is 99555?: 99555 is in USDA hardiness zone 4b.

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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