Grasslands Trail Run Marathon

Decatur, TX, USA · March 20, 2027

49°·62° high·Breezy·Dry

Weather

Race Day Weather

49°at start

65° high

Breezy

Dry

Cool temps, manageable winds

Runners will face a start temperature of 49°F, rising to 64°F by race end. Winds will come from the WSW at 11 mph, with gusts up to 23 mph, creating a headwind effect at times. With moderate humidity at 60%, runners should maintain hydration and consider a conservative pace to adapt to the warm-up as the race progresses.

Race day forecast available in 237 days

5 AM

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

Pre-raceRace windowPost-race

Pace Calculator

Distance: 26.2mi

Target Finish Time

0:00:00

HH:MM:SS

Pace

—

Weather Adj.

—

Common Goals:

Get forecast alerts for Grasslands Trail Run Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

Race Info

The Grasslands Trail Run is held in the Lyndon B. Johnson National Grasslands, more than 20,000 acres managed by the U.S. Forest Service and situated north of Fort Worth. The trails loop among rolling hills and through a mixture of pine and oak grove forests, open fields, and livestock. Run the 100-Mile, 50-Mile, Marathon, Half marathon (Saturday Start) or 15K (Sunday Start) and enjoy the beauty of the Grasslands while sharing the trails with horses and running past cows—don’t let the cows out! Source

Website

Course Map

FAQ

When is the 2027 Grasslands Trail Run Marathon?

The 2027 Grasslands Trail Run Marathon will be held on Saturday March 20, 2027.

Is the Grasslands Trail Run Marathon a Boston Marathon Qualifier?

No, the Grasslands Trail Run Marathon is NOT a Boston Marathon qualifier.

What will the weather be like for the 2027 Grasslands Trail Run Marathon?

The forecast calls for a high of 72°F and a low of 51°F with a 9% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 24 years of data

Avg Temp

64°F

L:49° H:64°

RunScore

Conditions

Rain Freq

21%

5 of 24 yrs

Wind10mph

Dew43°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Grasslands Trail Run Marathon Clear conditions throughout the day. 2026	57°/89°	-	52°
2025 Grasslands Trail Run Marathon Partly cloudy throughout the day. 2025	53°/62°	-	30°
2024 Grasslands Trail Run Marathon Partly cloudy throughout the day with rain. 2024	52°/57°	Light	52°
2023 Grasslands Trail Run Marathon Clear conditions throughout the day. 2023	38°/52°	-	23°
2022 Grasslands Trail Run Marathon Clear conditions throughout the day. 2022	43°/71°	-	26°
2021 Grasslands Trail Run Marathon Clear conditions throughout the day. 2021	43°/64°	-	35°
2019 Grasslands Trail Run Marathon Clear conditions throughout the day. 2019	38°/56°	-	21°
2018 Grasslands Trail Run Marathon Clear conditions throughout the day. 2018	53°/69°	-	36°
2017 Grasslands Trail Run Marathon Clearing in the afternoon. 2017	60°/81°	-	61°
2016 Grasslands Trail Run Marathon Clear conditions throughout the day. 2016	37°/56°	-	28°
2015 Grasslands Trail Run Marathon Partly cloudy throughout the day with rain. 2015	50°/58°	-	50°
2014 Grasslands Trail Run Marathon Cloudy skies throughout the day. 2014	53°/59°	-	36°
2013 Grasslands Trail Run Marathon Cloudy skies throughout the day with rain. 2013	41°/49°	Light	45°
2012 Grasslands Trail Run Marathon Clear conditions throughout the day. 2012	51°/72°	-	48°
2011 Grasslands Trail Run Marathon Clear conditions throughout the day. 2011	63°/82°	-	59°
2010 Grasslands Trail Run Marathon Cloudy skies throughout the day with rain or snow clearing later. 2010	32°/35°	Light	30°
2009 Grasslands Trail Run Marathon Clear conditions throughout the day. 2009	56°/71°	-	49°
2008 Grasslands Trail Run Marathon Clear conditions throughout the day. 2008	42°/71°	-	32°
2007 Grasslands Trail Run Marathon Partly cloudy throughout the day. 2007	61°/75°	-	58°
2006 Grasslands Trail Run Marathon Clear conditions throughout the day. 2006	37°/61°	-	33°
2005 Grasslands Trail Run Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2005	46°/49°	Moderate	46°
2004 Grasslands Trail Run Marathon Partly cloudy throughout the day with late afternoon rain. 2004	69°/81°	-	66°
2003 Grasslands Trail Run Marathon Partly cloudy throughout the day with rain. 2003	47°/58°	Light	47°
2001 Grasslands Trail Run Marathon Partly cloudy throughout the day with early morning rain. 2001	46°/70°	-	54°