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Chill hours in T8B

The short answer

T8B averages 1,105 chill hours per winter (7571,349 across 10 years) in USDA zone 3b.
T8B climate
Average chill hours1,105 (757–1,349 across 10 winters)
USDA hardiness zone3b (NRCan zone 3b)
Last spring frosttypically April 23 – May 21
First fall frosttypically September 28 – October 10

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 T8B’s chill hours and zone:

How many chill hours does T8B get?
T8B averages 1105 chill hours per winter, ranging from 757 to 1349 across the last 10 years.
What hardiness zone is T8B?
T8B 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