Manitoba, Canada / Soybean (Morris)

Total GDD: 2073 (Sep 30)

Day 144 / 144 (100%)

Current Season

Total GDD: 2073 (Sep 30)

Method: 50°F | 86°F max

7-Day Daily Avg: 12.7

7-Day Projection: 2162 by Oct 07

Season: May 10, 25 - Sep 30, 2025

Key Freeze Dates (32°F)

Last Freeze:
10%: 04-26
50%: 05-11
90%: 05-28

First Freeze:
10%: 09-19
50%: 10-02
90%: 10-13

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

Emergence (VE) 100 °D

May 14, 2025 | May 20, 2024 | May 16, 2023

Growth Stage

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Cotyledons above soil. Frost sensitive at 32°F.

Third Trifoliate (V3) 350 °D

Jun 7, 2025 | Jun 15, 2024 | Jun 2, 2023

Growth Stage

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Post-emergence herbicide window. Nodulation active.

Beginning Bloom (R1) 650 °D

Jun 28, 2025 | Jul 7, 2024 | Jun 17, 2023

Growth Stage

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First flower. Photoperiod-triggered. Critical water demand begins.

Full Bloom (R2) 800 °D

Jul 5, 2025 | Jul 13, 2024 | Jun 24, 2023

Growth Stage

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Peak flowering. Drought stress reduces pod set.

Beginning Pod (R3) 950 °D

Jul 14, 2025 | Jul 22, 2024 | Jul 2, 2023

Growth Stage

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Pods forming. Aphid scouting threshold 250/plant.

Full Pod (R4) 1100 °D

Jul 25, 2025 | Jul 29, 2024 | Jul 13, 2023

Growth Stage

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Seed fill begins. Maintain moisture.

Beginning Seed (R5) 1300 °D

Aug 6, 2025 | Aug 10, 2024 | Jul 26, 2023

Growth Stage

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Most critical yield stage. Stress reduces seed size.

Full Seed (R6) 1550 °D

Aug 21, 2025 | Aug 25, 2024 | Aug 8, 2023

Growth Stage

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Full-size green seed. Frost after R6 reduces yield 5-10%.

Beginning Maturity (R7) 1800 °D

Sep 10, 2025 | Sep 11, 2024 | Aug 25, 2023

Growth Stage

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Physiologically mature. Frost-safe. Leaves dropping.

Full Maturity (R8) 2000 °D

Sep 25, 2025 | Sep 25, 2024 | Sep 5, 2023

Growth Stage

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95% pods mature. Harvest at 13% moisture. Target before Sept 16 frost risk.