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Chill hours in J3H

The short answer

J3H averages 1,105 chill hours per winter (8891,519 across 10 years) in USDA zone 4b.
J3H climate
Average chill hours1,105 (889–1,519 across 10 winters)
USDA hardiness zone4b (NRCan zone 5b)
Last spring frosttypically April 27 – May 17
First fall frosttypically October 3 – October 30

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 J3H’s chill hours and zone:

How many chill hours does J3H get?
J3H averages 1105 chill hours per winter, ranging from 889 to 1519 across the last 10 years.
What hardiness zone is J3H?
J3H 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