Why Half the Course Is on Dirt: The Joint-Friendly Marathon Argument

The standard road marathon is 26.2 miles of asphalt. Asphalt is fast. It is also brutally inflexible. Every footstrike sends a near-100% return of impact up through your tibia, your knees, your hips, and your spine. The cumulative load is what makes a road marathon a 2 to 4 week recovery event, even for trained runners.

About half of the Malad Valley Marathon course (roughly 13 miles of the full, 6 to 7 of the half) runs on hard-packed dirt county road. Here is why we built it that way.

Dirt is gentler than asphalt

Hard-packed dirt and well-graded gravel road sit between asphalt (the stiffest common running surface) and natural trail (the softest), so the impact per footstrike is meaningfully lower than on pavement. Over roughly half a marathon, that adds up to a real difference in how your joints feel by the end.

This is not the same as the spongy trail-shoe-required surface of a true ultra. Hard-packed county road runs fast. You will not need different shoes. You will not lose time. You will just absorb less hammering.

Recovery is what runners actually feel

Most runners do not feel the impact difference during the race. They feel it on Tuesday. The week after a pure-asphalt marathon often involves heavy quads, sore hips, and a five-day pause on running. Runners who have done both surfaces report walking down stairs normally by Monday after a partial-dirt course, instead of Wednesday.

If you are a state collector running back-to-back marathons on consecutive weekends, that recovery window is the whole game. Half a marathon on dirt is a recovery insurance policy.

Hard-packed dirt is not loose gravel

We hear the worry every year. “I have road shoes, do I need trail shoes?” No. Our dirt sections are county-graded road, packed by farm and ranch trucks, smooth enough that any road shoe handles it. Carbon-plated super-shoes handle it. It runs nearly as fast as the paved sections.

Less heat, less glare

One underrated bonus: dirt road does not soak up sun the way asphalt does. The radiant heat coming off the dirt section in late morning is noticeably lower. On a sunny September race day in the upper 60s, that small difference shows up in how you feel by mile 20.

The course breakdown

The full marathon is two laps of the 13.1-mile loop, with about half of every lap on hard-packed dirt and half on quiet paved farm roads. The half marathon runs the same loop once. The 10K, 5K, and 1 Mile stay mostly on paved town roads.

Run it for your knees

If you have been told to back off marathon training because of knee or hip issues, a partial-dirt course is a sensible place to keep racing. Talk to your sports doc, but a lower-impact marathon course can be the difference between staying in the sport and leaving it.

Register

Pick your distance. Race day is Saturday, September 12, 2026 in Malad City, Idaho.