Wenatchee, Washington / Rainier Cherry

Total Chill: 1178 (Dec 31)

Day 66 / 183 (36%)

Current Season

Total Chill: 1178 (Dec 31)

Method: Utah Model

Season: Oct 15, 25 - Apr 15, 2026

Key Freeze Dates (32°F)

Last Freeze:
10%: 03-19
50%: 04-06
90%: 04-21

First Freeze:
10%: 10-14
50%: 10-28
90%: 11-09

Chill accumulation tracks the cold exposure needed for dormant fruit trees and plants to break dormancy and bloom properly in spring.

Thresholds mark specific chill values when dormancy requirements are typically met, with crossing dates showing when your season reaches each milestone.

Visit About and FAQ to learn more

Thresholds & Notes

Dormancy Established 200 Chill Hours

Oct 30, 2025 | Nov 1, 2024 | Nov 3, 2023 | Nov 3, 2022 | Oct 30, 2021

Hide notes

Leaf drop complete. Trees hardening off. First freeze typically late October.

Mid-Accumulation 500 Chill Hours

Nov 15, 2025 | Nov 18, 2024 | Jan 21, 2023 | Nov 21, 2023 | Nov 17, 2021

Hide notes

Deep dormancy. Pruning window opens.

Minimum Requirement Met 800 Chill Hours

Dec 4, 2025 | Dec 28, 2024 | Mar 2, 2023 | Dec 17, 2023 | Dec 11, 2021

Hide notes

Bing Rainier base satisfied. Trees capable of breaking dormancy if prolonged warmth occurs.

Full Requirement Met 1000 Chill Hours

Dec 14, 2025 | Feb 16, 2025 | Mar 19, 2023 | Dec 30, 2023 | Feb 15, 2022

Hide notes

Optimal chill for uniform budbreak. Warm spells now risk triggering early bloom.