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Chill hours in T1H

The short answer

T1H averages 1,657 chill hours per winter (1,3631,891 across 10 years) in USDA zone 4a.
T1H climate
Average chill hours1,657 (1,363–1,891 across 10 winters)
USDA hardiness zone4a (NRCan zone 4b)
Last spring frosttypically April 23 – May 21
First fall frosttypically September 28 – October 24

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 T1H’s chill hours and zone:

How many chill hours does T1H get?
T1H averages 1657 chill hours per winter, ranging from 1363 to 1891 across the last 10 years.
What hardiness zone is T1H?
T1H is in USDA hardiness zone 4a.

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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