Granite-Peak-bumps Granite Peak offers full mogul slopes to test your mettle.  (Granite Peak)

Spring season is a great time to hit those moguls building over the course of a season. Mogul busting is a springtime tradition at these resorts scattered across the upper Midwest. SnoCountry checks them out.

Three resorts—Boyne Mountain, Boyne Highlands and Nubs Nob—grouped around Petoskey and Harbor Springs in the northwest corner of Lower Michigan arguably offer the best collection of mogul runs around the Great Lakes.

Twilight Zone is one of three mogul slopes at Nubs Nob. (Nubs Nob)

Nubs Nob leads the way offering three mogul runs that will test your mettle. Twilight Zone is the best known and in full view of the lodge and lift.  Smooth Sailing also has a mogul field on skier’s right, and Pin Tail Peak’s Goosebumps is full of bumps top to bottom. The moguls are left to naturally form throughout the season. It’s a springtime rite of passage if you are a mogul skier.

Boyne Highlands Dark Side in full view of the Heather Express lift.

Boyne Highlands, across the valley from Nubs, offers the infamous Dark Side, which is a double-black run in full view of the Heather Express lift. Steep and deep by springtime, a good mogul run may draw applause from the lift. Boyne Mountain has moguls that form at the top of Aurora and Idiot’s Delight offers a quick shot through the bumps to test your skill.

Crystal Mountain's Gorge moguls keep growing throughout the season.

Crystal Mountain also offers a quick shot of some pretty dramatic moguls on Gorge. By springtime you can sometimes disappear in a mogul trough on the way down. Repeat runs will test your grit.

Lutsen Mountains' Hari Kari is a springtime tradition for mogul lovers. (Lutsen Mountains)

Lutsen Mountains has Hari Kari, a full slope of moguls that are in full view of the day lodge, outdoor patio and lift on the way up. It’s arguably the most famous of the Heartland’s mogul slopes and longtime spring tradition in northern Minnesota. April and early May are the best time to ski the moguls when they start to soften. A day on this slope will leave your legs feeling that thigh burn like out west.

Wisconsin’s Granite Peak, with its big 700-foot vertical, offers full slope mogul runs that will make you think of western slopes. Sugar Maple and Aspen combine to use the full length of Rib Mountain, and Mission Ridge, Infinity and Sundance are also fun to explore.