Golden Triangle, Montana / Winter Wheat

Total GDD: 3581 (Jul 31)

Day 139 / 139 (100%)

Current Season

Total GDD: 3581 (Jul 31)

Method: 32°F

7-Day Daily Avg: 40.6

7-Day Projection: 3865 by Aug 07

Season: Mar 15, 25 - Jul 31, 2025

Key Freeze Dates (32°F)

Last Freeze:
10%: 05-05
50%: 05-14
90%: 05-22

First Freeze:
10%: 09-09
50%: 09-12
90%: 09-13

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.

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Thresholds & Notes

Spring Green-up (GS25) 200 °D

Apr 1, 2025 | Apr 5, 2024 | Apr 10, 2023

Growth Stage

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Tillering resumes. Apply 60 lb N/acre Golden Triangle winter wheat.

Early Stem Elongation (GS30) 500 °D

Apr 22, 2025 | Apr 26, 2024 | May 1, 2023

Growth Stage

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First node detectable. Broadleaf herbicide window Montana winter wheat.

Second Node (GS32) 750 °D

May 5, 2025 | May 11, 2024 | May 9, 2023

Growth Stage

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Rapid stem extension. Scout for wheat stem sawfly Big Sandy region.

Flag Leaf Visible (GS37) 1000 °D

May 14, 2025 | May 21, 2024 | May 19, 2023

Growth Stage

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Flag leaf emerging. Stripe rust critical Golden Triangle wheat.

Flag Leaf Ligule (GS39) 1200 °D

May 24, 2025 | May 30, 2024 | May 25, 2023

Growth Stage

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T2 fungicide timing. Tan spot pressure Montana winter wheat.

Heading (GS55) 1600 °D

Jun 7, 2025 | Jun 13, 2024 | Jun 6, 2023

Growth Stage

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Heads 50% emerged. Wheat midge scouting Big Sandy fields.

Anthesis (GS65) 1800 °D

Jun 12, 2025 | Jun 21, 2024 | Jun 12, 2023

Growth Stage

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Flowering begins. Fusarium head blight window Montana wheat belt.

Grain Watery Ripe (GS71) 2100 °D

Jun 21, 2025 | Jun 30, 2024 | Jun 22, 2023

Growth Stage

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Kernel water content high. Final fungicide cutoff passed.

Soft Dough (GS85) 2600 °D

Jul 6, 2025 | Jul 13, 2024 | Jul 7, 2023

Growth Stage

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Grain crushable. Test weight forming Golden Triangle wheat.

Hard Dough (GS87) 2900 °D

Jul 13, 2025 | Jul 20, 2024 | Jul 15, 2023

Growth Stage

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Thumbnail imprint holds. Direct cut 14% moisture Big Sandy winter wheat.