Stockton, California / Walnut
Total Chill:
57
(Feb 26)
Day 118 / 135 (87%)
Current Season
Total Chill:
57
(Feb 26)
Method: Dynamic/Portions Model
Season: Nov 01, 25 - Mar 15, 2026
Key Freeze Dates (32°F)
Last Freeze:
10%: 01-08
50%: 02-22
90%: 03-15
10%: 01-08
50%: 02-22
90%: 03-15
First Freeze:
10%: 11-10
50%: 11-27
90%: 12-10
10%: 11-10
50%: 11-27
90%: 12-10
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.
Thresholds & Notes
Accumulation Begins
10
Chill Hours
Nov 30, 2025
|
Dec 2, 2024
|
Dec 8, 2023
|
Nov 22, 2022
|
Nov 30, 2021
Dormancy established. Begin scouting for walnut blight cankers during dormant period.
Mid-Accumulation
25
Chill Hours
Dec 28, 2025
|
Jan 7, 2024
|
Dec 26, 2024
|
Dec 15, 2022
|
Dec 21, 2021
Deep dormancy. Delayed dormant spray window for aphid and mite control.
Minimum Requirement Met
45
Chill Hours
Jan 30, 2026
|
Jan 31, 2025
|
Feb 16, 2024
|
Jan 18, 2023
|
Jan 21, 2022
Chandler base satisfied. Insufficient chill causes pistillate flower abortion.
Full Requirement Met
60
Chill Hours
Mar 6, 2025
|
Feb 12, 2023
|
Feb 25, 2022
Optimal for uniform leafout. Catkin emergence indicates male bloom approaching.