Ontario, Canada Hybrids / Corn (Perth)
Total GDD:
2279
(Oct 25)
Day 178 / 178 (100%)
Current Season
Total GDD:
2279
(Oct 25)
Method: 50°F | 86°F max
7-Day Daily Avg: 2.4
7-Day Projection: 2296 by Nov 01
Season: May 01, 25 - Oct 25, 2025
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 17, 2025
|
May 19, 2024
|
May 28, 2023
Growth Stage
Rapid Growth (V6)
400
°D
Jun 21, 2025
|
Jun 15, 2024
|
Jun 23, 2023
Growth Stage
Tassel Initiation (V12)
750
°D
Jul 6, 2025
|
Jul 4, 2024
|
Jul 13, 2023
Growth Stage
Tasseling (VT)
950
°D
Jul 16, 2025
|
Jul 15, 2024
|
Jul 25, 2023
Growth Stage
Silking (R1)
1050
°D
Jul 22, 2025
|
Jul 20, 2024
|
Jul 29, 2023
Growth Stage
Blister (R2)
1200
°D
Jul 29, 2025
|
Jul 29, 2024
|
Aug 8, 2023
Growth Stage
Milk (R3)
1400
°D
Aug 9, 2025
|
Aug 7, 2024
|
Aug 21, 2023
Growth Stage
Dough (R4)
1650
°D
Aug 20, 2025
|
Aug 24, 2024
|
Sep 8, 2023
Growth Stage
Dent (R5)
1850
°D
Sep 9, 2025
|
Sep 4, 2024
|
Sep 27, 2023
Growth Stage
Physiological Maturity (R6)
2100
°D
Sep 28, 2025
|
Sep 21, 2024
Growth Stage
Harvest Ready
2150
°D
Oct 4, 2025
|
Sep 24, 2024
Growth Stage