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2026 Northwest Series - Day 5 (ID)

Lewiston, Idaho, United States

calendar_today 23 Sep, 2026 – 24 Sep, 2026

directions_run Running

language Official Website

sell $55.00 – $155.00

About the Event

World's Best Marathon & Half Series!

No Time Limits

Great Food

Award-Winning Medals

Loony Community!

We RUN this country, TOGETHER!

Thanks for running with Mainly Marathons! Take a look at our website for additional details about this series and our other series of races. Take a look at the Northwest Series page to get details on each course.

Also, join our Facebook group to stay up-to-date with our loony adventures: Main Group and Northwest Series Group.

If you're interested in some Mainly Merch, check out our online store HERE. We'll offer some items (hats, stickers, magnets, mugs, etc.) in-person at the races, the Mainly Merch store best option for a variety of fun designs and quality merchandise to showcase your loonacy!

If you have any questions, email [email protected]

We RUN this country, TOGETHER!

Races Offered

10K - Individual Age group/open

Sep 23, 2026

straighten

Distance — 10K

terrain

Type — Running

timer

111 days remaining

sell

$65.00

50K - Individual Age group/open

Sep 23, 2026

straighten

Distance — 50K

terrain

Type — Running

timer

111 days remaining

sell

$155.00

5K - Individual Age group/open

Sep 23, 2026

straighten

Distance — 5K

terrain

Type — Running

timer

111 days remaining

sell

$55.00

Half Marathon - Individual Age group/open

Sep 23, 2026

straighten

Distance — 21.1K

terrain

Type — Running

timer

111 days remaining

sell

$125.00

Marathon - Individual Age group/open

Sep 23, 2026

straighten

Distance — 42.2K

terrain

Type — Running

timer

111 days remaining

sell

$145.00

Weather History

These values represent the 3-year monthly averages for September in Lewiston.

thermostat Temperature

14.7° / 27.9°

wb_sunny Feels like

13.9° / 26.5°

light_mode Avg sunshine hours

10h 12m

water_drop Avg rainfall

0.7 mm

ac_unit Avg snowfall

—

air Avg wind speed

5.3 km/h (Light breeze)

opacity Sweat loss rate

High

terrain Course conditions

Hard and dry surface

sunny Max UV Index

Moderate (3.5)

humidity_mid Humidity

52.7%

wb_twilight Sunrise

06:26

nightlight Sunset

18:57

About Lewiston

Learn more about the host city, Lewiston.

Lewiston is the county seat of and largest city in Nez Perce County, Idaho. It is the second largest city in the Idaho Panhandle region behind Coeur d'Alene. It sits across the river from Clarkston, Washington. In 2020, Lewiston was home to 34,000 people. Like Pocatello, Lewiston has a strong working-class heritage. Industries related to timber and logging pursuits have long been key to the city's economy. Because the Columbia and later the Snake River are navigable by some ocean-going vessels all the way to Lewiston, the city has the distinction of being Idaho's only port city, and the furthest inland port in the western United States.