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Chill hours in J7L

The short answer

J7L averages 1,254 chill hours per winter (1,0741,644 across 10 years) in USDA zone 4b.
J7L climate
Average chill hours1,254 (1,074–1,644 across 10 winters)
USDA hardiness zone4b (NRCan zone 5b)
Last spring frosttypically April 25 – May 9
First fall frosttypically October 18 – November 3

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 J7L’s chill hours and zone:

How many chill hours does J7L get?
J7L averages 1254 chill hours per winter, ranging from 1074 to 1644 across the last 10 years.
What hardiness zone is J7L?
J7L 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