Atlanta, Georgia / Bermudagrass Turf

Total GDD: 5360 (Oct 31)

Day 231 / 231 (100%)

Total GDD: 5360 (Oct 31)

Method: 50°F

7-Day Daily Avg: 3.6

7-Day Projection: 5385 by Nov 07

Season: Mar 15, 25 - Oct 31, 2025

Last Freeze:
10%: 02-18
50%: 03-13
90%: 03-29

First Freeze:
10%: 11-03
50%: 11-16
90%: 12-01

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

PGR Program Start 500 °D

Apr 20, 2025 | Apr 24, 2024 | Apr 26, 2023 | Apr 27, 2021

Growth Stage

Full green-up. Begin Primo Maxx at 200 GDD intervals. Scout for spring dead spot recovery.

Peak Growth Period 1500 °D

Jun 5, 2025 | Jun 6, 2024 | Jun 14, 2023 | Jun 13, 2021

Growth Stage

Maximum clipping yield. Tighten intervals to 7-10 days. Monitor dollar spot pressure.

Summer Peak 3000 °D

Jul 24, 2025 | Jul 23, 2024 | Aug 2, 2023 | Aug 5, 2021

Growth Stage

Humidity increases disease risk. Adjust PGR rates if large patch or pythium present.

Growth Slowing 4500 °D

Sep 16, 2025 | Sep 11, 2024 | Sep 23, 2023 | Oct 1, 2021

Growth Stage

Extend intervals to 14+ days. Final applications before fall sports season ramp-up.

PGR Program End 5200 °D

Oct 16, 2025 | Oct 9, 2024

Growth Stage

Discontinue applications. Allow carbohydrate storage before dormancy.