Tryptophan Half Marathon

Cumming, GA, USA · November 26, 2026

45°·47° high·Light·Dry

Weather

Tryptophan Half Marathon race day weather

45°at start

59° high

Breezy

Dry

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Cool start, light wind, possible rain

Runners will face temperatures rising from 45°F at the start to 47°F at the finish. Wind will be light at 9 mph from the NW, with gusts up to 22 mph. With humidity at 64%, runners should consider adjusting their pace conservatively and may want a throwaway layer for the pre-race wait due to the cooler feels-like temperature.

Race day forecast available in 3 days

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Distance: 13.1mi

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About the Tryptophan Half Marathon

The Tryptophan Half Marathon is run on Thanksgiving morning in Cumming, Georgia, with a 10K, a 5K and a 1K fun run on the same day. All distances start and finish in front of Rosati's Pizza and Sports Pub on Peachtree Parkway. The 5K is a mostly flat course south on Peachtree Parkway, the 10K runs on to a turnaround before Sharon Road, and the half marathon continues past the Brookwood Target before returning to the finish. Runners can also enter virtually.

Website

Race weekend

Thursday, November 26

7:30 AMHalf Marathon (13.1 mi)

7:45 AM10K (6.2 mi)

8:00 AM5K (3.1 mi)

9:00 AM1K Fun Run (0.6 mi)

Course Map

Tryptophan Half Marathon FAQ

When is the 2026 Tryptophan Half Marathon?

The 2026 Tryptophan Half Marathon will be held on Thursday November 26, 2026.

What will the weather be like for the 2026 Tryptophan Half Marathon?

The forecast calls for a high of 60°F and a low of 41°F with a 8% chance of rain.

What is the weather usually like for the Tryptophan Half Marathon?

Over the 7 years racecast.io has race-day weather for (2015 to 2024), it averaged 51°F at the start and 53°F by a typical finish. Rain fell during race hours in 2 of those years (2020 and 2024).

What was the hottest Tryptophan Half Marathon?

Of the 7 years on record, 2024 was the warmest, reaching 63°F during race hours. The coldest start was 2023, at 38°F.

What was the windiest Tryptophan Half Marathon?

Of the 7 years on record, 2024 was the windiest, with wind averaging 11 mph during race hours. The calmest was 2016, at 1 mph.

Tryptophan Half Marathon weather history

Based on 7 years of data

Avg Temp

51°F

L:50° H:53°

RunScore

Conditions

Rain Freq

29%

2 of 7 yrs

Wind6mph

Dew42°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2024 Tryptophan Half Marathon Partly cloudy throughout the day with early morning rain. 2024	62°/63°	Light	57°
2023 Tryptophan Half Marathon Clear conditions throughout the day. 2023	38°/43°	-	37°
2022 Tryptophan Half Marathon Cloudy skies throughout the day. 2022	51°/53°	-	32°
2020 Tryptophan Half Marathon Clearing in the afternoon with rain clearing later. 2020	60°/62°	Light	61°
2017 Tryptophan Half Marathon Clear conditions throughout the day. 2017	42°/44°	-	29°
2016 Tryptophan Half Marathon Partly cloudy throughout the day. 2016	52°/57°	-	46°
2015 Tryptophan Half Marathon Clear conditions throughout the day. 2015	47°/51°	-	37°