Lake Lowell Marathon, Half Marathon, 10K & 5K

Saturday, April 14, 2018 • Nampa, IDCourse Map

A nearly completely flat course around the shoreline of Lake Lowell inside Idaho’s Deer Flat National Wildlife Refuge awaits runners at the annual Lake Lowell Marathon & Half Marathon, which sees a few hundred runners cross the finish line in all races combined each year.

The race takes runners along the roads that wind around Lake Lowell inside the Deer Flat National Wildlife Refuge, whose 10,588 acres first became a refuge for migratory birds like mallards and Canada geese back in 1909, when president Theodore Roosevelt first set aside for protection the land then known as the Deer Flat Reservoir as a national bird refuge.

The nearby Snake River Islands Refuge was set aside for protection in the 1930s, and the two were consolidated into a single park and refuge for birds, trees and other wildlife in the early 1960s.

Today, of course, the refuge’s open water, wetlands, grasslands and forest areas remain an important bird sanctuary and offer a peaceful, serene setting for the Lake Lowell race. For runners in the half marathon, the out-and-back race begins on the eastern/northern end of the lake, in Lake Lowell Park.

From the half marathon starting line, the race then unfolds along a sideways U-shaped route that’s almost entirely flat. The only hill of any real significance doesn’t rise up to meet runners until they’ve reached the mile 10 marker, where the course rises just over 100 feet in elevation between miles 10 and 11 along Indiana Avenue.

Once they’ve passed the mile 11 marker, the road descends just as quickly as it rose, bringing runners south toward the Upper Dam.

Race Weather & Climate

Located just miles from the Boise River in western Idaho, about 20 miles from downtown Boise, Nampa typically sees cold to mild weather and usually little rainfall in April, a month that has brought record temperatures here as low as 20 degrees (in 1979) and as high as 93 degrees (in 1987).

On race day (April 14), the average low is 35ºF and the average high is 62ºF.

Past Results

Course Map

See the race route map for the Lake Lowell Half Marathon here.

Starting Time

  • 7:00 AM – full marathon
  • 8:00 AM – half marathon
  • 8:20 AM – 10K
  • 8:40 AM – 5K


  • $45 – $60 for the half marathon
  • $70 – $100 for the full marathon
  • $30 – $45 for the 10K
  • $25 – $35 for the 5K


To reserve your spot in the 2018 running of Nampa’s Lake Lowell Marathon, Half Marathon, 10K or 5K race, register online at here.

Official Race Website


Ever run in the Lake Lowell Half Marathon? Share your impressions here, or post your review in the Comments below.

See more races in: April, Idaho

0 comments… add one

Leave a Comment