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Chill hours in 13613

The short answer

13613 averages 1,386 chill hours per winter (1,1041,659 across 10 years) in USDA zone 4b.
13613 climate
Average chill hours1,386 (1,104–1,659 across 10 winters)
USDA hardiness zone4b
Last spring frosttypically April 25 – May 14
First fall frosttypically October 5 – November 4

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 13613’s chill hours and zone:

How many chill hours does 13613 get?
13613 averages 1386 chill hours per winter, ranging from 1104 to 1659 across the last 10 years.
What hardiness zone is 13613?
13613 is in USDA hardiness zone 4b.

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Sources

  1. [1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
  2. [2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026