Nashville, Tennessee / Tall Fescue Turf

Total GDD: 5233 (Oct 31)

Day 245 / 245 (100%)

Total GDD: 5233 (Oct 31)

Method: 50°F

7-Day Daily Avg: 5.5

7-Day Projection: 5272 by Nov 07

Season: Mar 01, 25 - Oct 31, 2025

Last Freeze:
10%: 03-11
50%: 03-27
90%: 04-15

First Freeze:
10%: 10-25
50%: 11-02
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.

Visit About and FAQ to learn more

PGR Program Start 250 °D

Mar 31, 2025 | Apr 2, 2024 | Apr 5, 2023 | Apr 12, 2022

Growth Stage

Spring growth active. Begin Primo Maxx at 250 GDD intervals. Apply pre-emergent for crabgrass.

Spring Peak 750 °D

May 3, 2025 | May 5, 2024 | May 15, 2023 | May 13, 2022

Growth Stage

Maximum spring growth. Tighten intervals to 14 days. Scout for brown patch as humidity rises.

Summer Stress 2000 °D

Jun 26, 2025 | Jun 25, 2024 | Jul 4, 2023 | Jun 27, 2022

Growth Stage

Reduce or pause PGR. Raise mowing height to 3.5-4 inches. Prioritize irrigation and disease control.

Fall Recovery 4000 °D

Aug 29, 2025 | Aug 28, 2024 | Sep 11, 2023 | Aug 31, 2022

Growth Stage

Second growth flush. Resume PGR program. Prime overseeding window for bare spots.

PGR Program End 4700 °D

Sep 27, 2025 | Sep 23, 2024 | Oct 20, 2023 | Sep 30, 2022

Growth Stage