Runners will face temperatures starting at 41°F and rising to 51°F, with a light breeze from the SE at 9 mph. Humidity will be high at 98%, which may impact comfort levels. It's advisable to maintain a conservative pace early on and stay hydrated throughout the race.

5 AM

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

4 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 Seneca Creek Greenway Trail 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

In this race, you will experience some of Montgomery County's finest single-track trails as you meander along beautiful Seneca Creek in Seneca State Park. This scenic trail is muddy, rocky, rooty, hilly and steep in sections with no major elevation gain/loss. This is a challenging, but beautiful run for all!

The Seneca Creek Greenway Trail Marathon and 50K is a low-key, low-priced and fun filled event along the beautiful Seneca Creek Greenway Trail and parallel trails. Marathon and 50K participants will have the option to choose their final distance when returning to the finish (either stop for the "marathon" or keep going for the 50K. Source

Website

Race weekend

Saturday, March 7

7:30 AMMarathon (26.2 mi)

50K (31.1 mi)

Course Map

FAQ

When is the 2026 Seneca Creek Greenway Trail Marathon?

The 2026 Seneca Creek Greenway Trail Marathon will be held on Saturday March 7, 2026.

Is the Seneca Creek Greenway Trail Marathon a Boston Marathon Qualifier?

No, the Seneca Creek Greenway Trail Marathon is NOT a Boston Marathon qualifier.

What will the weather be like for the 2026 Seneca Creek Greenway Trail Marathon?

The forecast calls for a high of 62°F and a low of 42°F with a 0% chance of rain. Check our detailed hourly forecast above for the best marathon race plan.

Historical Weather

Based on 22 years of data

Avg Temp

40°F

L:36° H:45°

RunScore

Conditions

Rain Freq

23%

5 of 22 yrs

Wind9mph

Dew29°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2026 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day. 2026	42°/47°	-	43°
2025 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day. 2025	37°/44°	-	30°
2024 Seneca Creek Greenway Trail Marathon Cloudy skies throughout the day with a chance of rain throughout the day. 2024	40°/42°	Light	40°
2023 Seneca Creek Greenway Trail Marathon Cloudy skies throughout the day. 2023	35°/41°	-	26°
2021 Seneca Creek Greenway Trail Marathon Clear conditions throughout the day. 2021	40°/48°	-	10°
2020 Seneca Creek Greenway Trail Marathon Clearing in the afternoon. 2020	36°/44°	-	22°
2019 Seneca Creek Greenway Trail Marathon Cloudy skies throughout the day with a chance of rain or snow throughout the day. 2019	32°/37°	Light	32°
2018 Seneca Creek Greenway Trail Marathon Clear conditions throughout the day. 2018	33°/44°	-	23°
2017 Seneca Creek Greenway Trail Marathon Clear conditions throughout the day. 2017	22°/34°	-	11°
2016 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day. 2016	33°/37°	-	21°
2015 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day with rain or snow clearing later. 2015	32°/40°	Light	31°
2014 Seneca Creek Greenway Trail Marathon Clear conditions throughout the day. 2014	27°/52°	-	30°
2013 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day. 2013	30°/33°	-	20°
2012 Seneca Creek Greenway Trail Marathon Clearing in the afternoon with rain clearing later. 2012	46°/50°	Light	43°
2011 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day with late afternoon rain. 2011	44°/53°	-	44°
2010 Seneca Creek Greenway Trail Marathon Clear conditions throughout the day. 2010	29°/42°	-	15°
2009 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day. 2009	50°/70°	-	48°
2008 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day with rain clearing later. 2008	39°/42°	-	21°
2007 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day with afternoon rain. 2007	32°/52°	-	27°
2006 Seneca Creek Greenway Trail Marathon Clear conditions throughout the day. 2006	27°/39°	-	15°
2005 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day. 2005	33°/39°	-	20°
2004 Seneca Creek Greenway Trail Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2004	58°/63°	Light	59°