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Chill hours in P1H

The short answer

P1H averages 1,294 chill hours per winter (1,1071,593 across 10 years) in USDA zone 4b.
P1H climate
Average chill hours1,294 (1,107–1,593 across 10 winters)
USDA hardiness zone4b (NRCan zone 4b)
Last spring frosttypically April 27 – May 17
First fall frosttypically October 18 – November 7

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 P1H’s chill hours and zone:

How many chill hours does P1H get?
P1H averages 1294 chill hours per winter, ranging from 1107 to 1593 across the last 10 years.
What hardiness zone is P1H?
P1H is in USDA hardiness zone 4b.

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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