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Chill hours in J8C

The short answer

J8C averages 1,037 chill hours per winter (7811,500 across 10 years) in USDA zone 4b.
J8C climate
Average chill hours1,037 (781–1,500 across 10 winters)
USDA hardiness zone4b (NRCan zone 4a)
Last spring frosttypically May 7 – May 23
First fall frosttypically October 10 – November 1

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023 / NRCan 1981–2010. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against J8C’s chill hours and zone:

How many chill hours does J8C get?
J8C averages 1037 chill hours per winter, ranging from 781 to 1500 across the last 10 years.
What hardiness zone is J8C?
J8C 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] Natural Resources Canada. Plant Hardiness Zones of Canada — accessed July 2026