Tampa, FL / St. Augustinegrass Turf

Total GDD: 9236 (Dec 29)

Day 363 / 365 (100%)

Total GDD: 9236 (Dec 29)

Method: 50°F

7-Day Daily Avg: 18.6

7-Day Projection: 9366 by Jan 05

Season: Jan 01, 25 - Dec 31, 2025

Last Freeze:
10%: 01-03
50%: 01-19
90%: 02-05

First Freeze:
10%: 12-15
50%: 12-20
90%: 12-23

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.

Visit About and FAQ to learn more

Spring Ramp-Up 1000 °D

Mar 16, 2025 | Mar 13, 2024 | Mar 1, 2023

Growth Stage

Active growth resumes. Begin Primo Maxx at 250-300 GDD intervals. Scout for chinch bugs.

Peak Growth 3000 °D

May 29, 2025 | May 30, 2024 | May 20, 2023

Growth Stage

Maximum growth rate. Tighten intervals. Gray leaf spot pressure increases with afternoon storms.

Summer Maintenance 5000 °D

Jul 27, 2025 | Jul 28, 2024 | Jul 20, 2023

Growth Stage

Sustained high growth. Maintain mowing at 3.5-4 inches. Reduce rates if heat stressed.

Fall Transition 7000 °D

Sep 24, 2025 | Sep 26, 2024 | Sep 14, 2023

Growth Stage

Growth slowing. Extend intervals to 3+ weeks. Take-all root rot scouting window.

Winter Reduction 8500 °D

Nov 20, 2025 | Nov 20, 2024 | Nov 9, 2023

Growth Stage

Minimal PGR needed. Growth continues but slows significantly through February.