Lubbock, Texas / Cotton
Total GDD:
3540
(Nov 15)
Day 229 / 229 (100%)
Current Season
Total GDD:
3540
(Nov 15)
Method: 60°F Sine | 95°F max
7-Day Daily Avg: 7.2
7-Day Projection: 3590 by Nov 22
Season: Apr 01, 25 - Nov 15, 2025
Key Freeze Dates (32°F)
Last Freeze:
10%: 03-19
50%: 04-07
90%: 04-19
10%: 03-19
50%: 04-07
90%: 04-19
First Freeze:
10%: 10-16
50%: 10-30
90%: 11-18
10%: 10-16
50%: 10-30
90%: 11-18
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
First True Leaf
100
°D
Apr 14, 2025
|
Apr 15, 2024
|
Apr 17, 2023
Growth Stage
Pinhead Square
425
°D
May 18, 2025
|
May 19, 2024
|
May 23, 2023
Growth Stage
First Bloom
600
°D
May 28, 2025
|
May 29, 2024
|
Jun 9, 2023
Growth Stage
Peakbloom
900
°D
Jun 15, 2025
|
Jun 14, 2024
|
Jun 24, 2023
Growth Stage
First Cracked Boll
1200
°D
Jun 28, 2025
|
Jun 28, 2024
|
Jul 7, 2023
Growth Stage
First Open Boll
1500
°D
Jul 13, 2025
|
Jul 11, 2024
|
Jul 19, 2023
Growth Stage
60% Open
2100
°D
Aug 8, 2025
|
Aug 6, 2024
|
Aug 11, 2023
Growth Stage
Defolication Complete
2400
°D
Aug 20, 2025
|
Aug 18, 2024
|
Aug 24, 2023
Growth Stage
Harvest Ready
2600
°D
Aug 30, 2025
|
Aug 25, 2024
|
Sep 2, 2023
Growth Stage