Patterson, California / Apricot

Total Chill: 58 (Feb 28)

Day 115 / 135 (85%)

Current Season

Total Chill: 58 (Feb 28)

Method: Dynamic/Portions Model

Season: Nov 01, 25 - Mar 15, 2026

Key Freeze Dates (32°F)

Last Freeze:
10%: 01-07
50%: 02-05
90%: 02-25

First Freeze:
10%: 11-19
50%: 12-02
90%: 12-24

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.

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Thresholds & Notes

Accumulation Begins 10 Chill Hours

Nov 30, 2025 | Nov 30, 2024 | Dec 3, 2023 | Nov 17, 2022

Hide notes

Leaf drop complete. Dormant spray window opens for peach twig borer and brown rot.

Minimum Requirement Met 20 Chill Hours

Dec 13, 2025 | Dec 16, 2024 | Dec 23, 2023 | Dec 3, 2022

Hide notes

Blenheim and Royal base chill satisfied. Trees responsive to warm spells. Avoid late nitrogen.

Full Requirement Met 35 Chill Hours

Jan 11, 2026 | Jan 12, 2025 | Jan 15, 2024 | Dec 23, 2022

Hide notes

Uniform bloom expected. Begin monitoring bud swell. Prepare smudge pots or wind machines.

Chill Season Complete 50 Chill Hours

Feb 10, 2026 | Feb 7, 2025 | Feb 11, 2024 | Jan 16, 2023

Hide notes

Pink bud to bloom imminent. Frost protection critical. Apricot flowers damaged at 28F.