The 2026 Idaho Falls Marathon has concluded.

Idaho Falls Marathon

Race complete

Idaho Falls, ID, USA · July 25, 2026

59°·92° high·Windy·Dry

Race Day Weather

59°at start

96° high

Windy

Dry

Warm start, heat builds quickly

Runners will face a rising temperature trend from 63°F at the start to 94°F by the finish, with average humidity at 52%. Winds will be from the SE at 16 mph, providing a headwind throughout. It's essential to adjust pacing conservatively, especially as the heat increases, to avoid fatigue.

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Distance: 26.2mi

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Race Info

The Idaho Falls Marathon offers a scenic and fast course, beginning and ending at Snake River Landing. The marathon course runs the first half west through beautiful southeast Idaho farm country and back through historic New Sweden. The marathon returns to the start point to continue clockwise around the Snake River Greenbelt for the remaining half and finishes where you started.

Website

Course Map

FAQ

When is the 2026 Idaho Falls Marathon?

The 2026 Idaho Falls Marathon will be held on Saturday July 25, 2026.

What will the weather be like for the 2026 Idaho Falls Marathon?

The forecast calls for a high of 98°F and a low of 59°F with a 0% chance of rain.

Historical Weather

Based on 11 years of data

Avg Temp

81°F

L:54° H:81°

RunScore

Conditions

Rain Freq

1 of 11 yrs

Wind10mph

Dew46°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Idaho Falls Marathon Clear conditions throughout the day. 2025	45°/79°	-	38°
2024 Idaho Falls Marathon Partly cloudy throughout the day with late afternoon rain. 2024	51°/82°	-	48°
2023 Idaho Falls Marathon Clear conditions throughout the day. 2023	54°/84°	-	53°
2022 Idaho Falls Marathon Clear conditions throughout the day. 2022	53°/87°	-	50°
2021 Idaho Falls Marathon Partly cloudy throughout the day with rain clearing later. 2021	63°/76°	Moderate	62°
2019 Idaho Falls Marathon Partly cloudy throughout the day with late afternoon rain. 2019	65°/75°	-	51°
2018 Idaho Falls Marathon Partly cloudy throughout the day. 2018	54°/79°	-	48°
2017 Idaho Falls Marathon Clear conditions throughout the day. 2017	50°/83°	-	52°
2016 Idaho Falls Marathon Clear conditions throughout the day. 2016	57°/86°	-	45°
2015 Idaho Falls Marathon Clear conditions throughout the day. 2015	46°/81°	-	46°
2014 Idaho Falls Marathon Clear conditions throughout the day. 2014	55°/82°	-	39°