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Chill hours in T0B

The short answer

T0B averages 1,001 chill hours per winter (5451,270 across 10 years) in USDA zone 3b.
T0B climate
Average chill hours1,001 (545–1,270 across 10 winters)
USDA hardiness zone3b (NRCan zone 3a)
Last spring frosttypically April 29 – 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 T0B’s chill hours and zone:

How many chill hours does T0B get?
T0B averages 1001 chill hours per winter, ranging from 545 to 1270 across the last 10 years.
What hardiness zone is T0B?
T0B 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