Red River Valley, MB, Canada / Soybean (Steinbach)
Total GDD:
1981
(Sep 15)
Day 129 / 129 (100%)
Current Season
Total GDD:
1981
(Sep 15)
Method: 50°F | 86°F max
7-Day Daily Avg: 16.1
7-Day Projection: 2094 by Sep 22
Season: May 10, 25 - Sep 15, 2025
Key Freeze Dates (32°F)
Last Freeze:
10%: 05-02
50%: 05-18
90%: 06-06
10%: 05-02
50%: 05-18
90%: 06-06
First Freeze:
10%: 09-16
50%: 09-30
90%: 10-12
10%: 09-16
50%: 09-30
90%: 10-12
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.
Thresholds & Notes
Emergence (VE)
100
°D
May 14, 2025
|
May 21, 2024
|
May 16, 2023
Growth Stage
Cotyledons above soil. Frost sensitive at 32°F.
Third Trifoliate (V3)
350
°D
Jun 5, 2025
|
Jun 15, 2024
|
Jun 1, 2023
Growth Stage
Post-emergence herbicide window. Nodulation active.
Beginning Bloom (R1)
650
°D
Jun 27, 2025
|
Jul 6, 2024
|
Jun 14, 2023
Growth Stage
First flower. Photoperiod-triggered. Critical water demand begins.
Full Bloom (R2)
800
°D
Jul 4, 2025
|
Jul 13, 2024
|
Jun 22, 2023
Growth Stage
Peak flowering. Drought stress reduces pod set.
Beginning Pod (R3)
950
°D
Jul 13, 2025
|
Jul 21, 2024
|
Jun 30, 2023
Growth Stage
Pods forming. Aphid scouting threshold 250/plant.
Full Pod (R4)
1100
°D
Jul 23, 2025
|
Jul 28, 2024
|
Jul 9, 2023
Growth Stage
Seed fill begins. Maintain moisture.
Beginning Seed (R5)
1300
°D
Aug 3, 2025
|
Aug 7, 2024
|
Jul 23, 2023
Growth Stage
Most critical yield stage. Stress reduces seed size.
Full Seed (R6)
1550
°D
Aug 17, 2025
|
Aug 23, 2024
|
Aug 5, 2023
Growth Stage
Full-size green seed. Frost after R6 reduces yield 5-10%.
Beginning Maturity (R7)
1800
°D
Sep 1, 2025
|
Sep 7, 2024
|
Aug 20, 2023
Growth Stage
Physiologically mature. Frost-safe. Leaves dropping.
Full Maturity (R8)
2000
°D
Sep 2, 2023
Growth Stage
95% pods mature. Harvest at 13% moisture. Target before Sept 16 frost risk.