Skip to content
EveryOrchard
Menu

Location almanac

Chill hours in P4R

The short answer

P4R averages 1,003 chill hours per winter (7251,265 across 10 years) in USDA zone 4a.
P4R climate
Average chill hours1,003 (725–1,265 across 10 winters)
USDA hardiness zone4a (NRCan zone 2b)
Last spring frosttypically May 8 – May 28
First fall frosttypically October 1 – October 17

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 P4R’s chill hours and zone:

How many chill hours does P4R get?
P4R averages 1003 chill hours per winter, ranging from 725 to 1265 across the last 10 years.
What hardiness zone is P4R?
P4R is in USDA hardiness zone 4a.

Growing fruit trees in P4R? Get a care calendar anchored to this exact climate, with email reminders.

Start My Orchard

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