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Chill hours in T8H

The short answer

T8H averages 1,090 chill hours per winter (7151,332 across 10 years) in USDA zone 3b.
T8H climate
Average chill hours1,090 (715–1,332 across 10 winters)
USDA hardiness zone3b (NRCan zone 3b)
Last spring frosttypically April 23 – May 21
First fall frosttypically September 28 – October 13

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 T8H’s chill hours and zone:

How many chill hours does T8H get?
T8H averages 1090 chill hours per winter, ranging from 715 to 1332 across the last 10 years.
What hardiness zone is T8H?
T8H 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