Traverse City, Michigan / Montmorency Cherry

Total GDD: 2234 (Jul 31)

Day 108 / 108 (100%)

Current Season

Total GDD: 2234 (Jul 31)

Method: 41°F

7-Day Daily Avg: 32.4

7-Day Projection: 2461 by Aug 07

Season: Apr 15, 25 - Jul 31, 2025

Key Freeze Dates (32°F)

Last Freeze:
10%: 05-04
50%: 05-13
90%: 05-25

First Freeze:
10%: -- (rarely occurs)
50%: -- (rarely occurs)
90%: -- (rarely occurs)

Growing Degree Days (GDD) track heat accumulation to predict when plants reach growth stages, pests emerge, and diseases become active.

Thresholds mark specific GDD values when events typically occur, with crossing dates showing when your season reaches each milestone.

Visit About and FAQ to learn more

Thresholds & Notes

Bud Swell 150 °D

May 6, 2025 | Apr 28, 2024 | May 6, 2023 | May 5, 2022

Growth Stage

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Copper spray cutoff. Frost protection equipment tested and ready.

Green Tip 250 °D

May 13, 2025 | May 6, 2024 | May 12, 2023 | May 11, 2022

Growth Stage

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Critical frost period. Wind machines on standby <34°F predicted.

Full Bloom 400 °D

May 24, 2025 | May 16, 2024 | May 21, 2023 | May 16, 2022

Growth Stage

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Propiconazole for brown rot if wet. Bee activity monitoring.

Petal Fall 500 °D

May 30, 2025 | May 20, 2024 | May 26, 2023 | May 23, 2022

Growth Stage

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Indar + Captan spray. Plum curculio control window opens.

Shuck Fall 700 °D

Jun 9, 2025 | May 30, 2024 | Jun 3, 2023 | Jun 1, 2022

Growth Stage

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Cherry leaf spot protection critical. Set irrigation for sizing.

Green Fruit 1000 °D

Jun 22, 2025 | Jun 12, 2024 | Jun 18, 2023 | Jun 15, 2022

Growth Stage

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American brown rot scouting. Final leaf spot spray if pressure high.

Straw Color 1400 °D

Jul 4, 2025 | Jun 25, 2024 | Jul 1, 2023 | Jun 29, 2022

Growth Stage

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Begin brix testing. Target 14-16 brix for processors.

First Color 1700 °D

Jul 14, 2025 | Jul 7, 2024 | Jul 11, 2023 | Jul 9, 2022

Growth Stage

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SWD monitoring intensifies. Schedule harvest crews and tanks.

Harvest Ready 2000 °D

Jul 24, 2025 | Jul 15, 2024 | Jul 22, 2023 | Jul 19, 2022

Growth Stage

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Shake harvest at 4.5-5 lbs force. Tank delivery within 4 hours.