Free State, South Africa / Corn

Total GDD: 4401 (May 31)

Day 243 / 243 (100%)

Total GDD: 4401 (May 31)

Method: 50°F

7-Day Daily Avg: 0.3

7-Day Projection: 4403 by Jun 07

Season: Oct 01, 24 - May 31, 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.

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VE-Emergence 125 °D

Oct 11, 2024 | Oct 7, 2023 | Oct 8, 2022 | Oct 12, 2021

Growth Stage

Stand establishment critical. Monitor soil temperature >50°F for uniform germination. Assess plant p

V6-6 Leaf 500 °D

Nov 2, 2024 | Oct 31, 2023 | Oct 25, 2022 | Nov 9, 2021

Growth Stage

Active vegetative growth. Begin nitrogen sidedress timing. Scout for cutworm and armyworm damage.

VT-Tasseling 1200 °D

Dec 5, 2024 | Dec 2, 2023 | Dec 7, 2022 | Dec 21, 2021

Growth Stage

Critical pollination window begins. Ensure adequate soil moisture. Monitor for European corn borer.

R1-Silking 1700 °D

Dec 22, 2024 | Jan 3, 2023 | Dec 24, 2023 | Jan 16, 2022

Growth Stage

Pollination complete. Kernel development begins. Peak water demand period. Scout for corn earworm.

R6-Maturity 2800 °D

Feb 2, 2025 | Feb 12, 2024 | Feb 24, 2023 | Mar 11, 2022

Growth Stage

Kernel black layer formation. Determine harvest moisture targets. Monitor for stalk rots and lodging