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Chill hours in T4H

The short answer

T4H averages 1,302 chill hours per winter (9671,547 across 10 years) in USDA zone 3b.
T4H climate
Average chill hours1,302 (967–1,547 across 10 winters)
USDA hardiness zone3b (NRCan zone 3b)
Last spring frosttypically May 2 – May 22
First fall frosttypically September 22 – October 14

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 T4H’s chill hours and zone:

How many chill hours does T4H get?
T4H averages 1302 chill hours per winter, ranging from 967 to 1547 across the last 10 years.
What hardiness zone is T4H?
T4H is in USDA hardiness zone 3b.

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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