Namoi Valley, Northern NSW, Australia / Corn

Total GDD: 2911 (Feb 12)

Day 165 / 273 (60%)

Total GDD: 2911 (Feb 12)

Method: 60°F | 95°F max

7-Day Daily Avg: 24.4

7-Day Projection: 3082 by Feb 19

Season: Sep 01, 25 - May 31, 2026

Last Freeze:
10%: 08-05
50%: 08-20
90%: 09-09

First Freeze:
10%: 05-10
50%: 05-31
90%: 07-05

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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Emergence 80 °D

Sep 14, 2025 | Sep 10, 2024 | Sep 10, 2023 | Sep 19, 2022

Growth Stage

Cotyledons visible. Assess stand establishment and plant density. Monitor soil moisture. Squaring 4

Squaring 500 °D

Oct 18, 2025 | Oct 24, 2024 | Oct 14, 2023 | Nov 10, 2022

Growth Stage

First flower buds (squares) appear. Begin insect monitoring. Apply nitrogen if needed.

First Flower 950 °D

Nov 16, 2025 | Nov 18, 2024 | Nov 14, 2023 | Dec 17, 2022

Growth Stage

First white flowers open. Critical irrigation period begins. Peak nitrogen uptake.

Peak Bloom 1500 °D

Dec 16, 2025 | Dec 17, 2024 | Dec 13, 2023 | Jan 18, 2023

Growth Stage

Maximum flowering. Peak water demand. Monitor for heat stress above 38C. Scout for pests.

First Open Boll 1950 °D

Jan 5, 2026 | Jan 7, 2025 | Jan 4, 2024 | Feb 10, 2023

Growth Stage

Bolls begin opening. Monitor boll fill. Ensure adequate water for fiber development.

Defoliation Harvest Ready 3100 °D

Mar 2, 2025 | Feb 23, 2024 | Apr 26, 2023

Growth Stage

Crop maturity. Plan defoliation timing. Monitor for weather conditions suitable for harvest.