Middleville, Michigan (United States of America) - "Winter Trail Fest Half Marathon & 5 Mile - Westside". Some call it the Winter Trail Fest. Others just think, What The F?! Join Trivium Racing for a winter trail Half Marathon or 5 Mile run or ruck at Yankee Springs. Expect snow, mud, ice, and the infamous river crossing unless you take the slightly longer alternate route (+0.25 mi) to stay dry. We’re hoping for true WTF conditions, and the afternoon start gives both you and the temps a chance to warm up before you hit the trails. Earn your WTF hoodie, epic medal, and bragging rights the hard way. WTF West draws a wild mix of first-time trail runners, die-hard winter warriors, and ruckers ready to grind. Come for the challenge, stay for the bonfires, and leave with a story you’ll tell until the snow melts. Then join us in June for Summer Trail Fest Ultra (STFU) 50K, Half, or 5 Mile to complete the magnetic medal series set. https://runsignup.com/Race/MI/Middleville/WinterTrailFest?aflt_token=7LipmEOzbECERDzMZ3v2Xv14ohnqORDf

Milford, Michigan (United States of America) - "Prove It 5K & 10K". Looking for a Michigan spring 5K or 10K that's unlike anything else? Prove It 5K & 10K gives you exclusive access to the GM Milford Proving Ground, one of the most iconic and secretive automotive testing facilities in the world. Normally closed to the public, this track opens just one day each year for runners and walkers to take on its twists, hills, and high-performance curves. This isn't your typical local race. The 5K packs 225′ of elevation gain in one lap of the course. The 10K doubles the challenge with two laps and 450′ of gain. Both races are USATF-certified, making them perfect for testing your speed and endurance. Want more? Register for the Double Event to run both distances back-to-back for the ultimate test. Why Run Prove It? Race where few ever will—GM Milford Proving Ground is off-limits to the public. Steeped in car culture—the same track where GM tests world-class vehicles. Challenge yourself—225′ of gain in the 5K, 450′ in the 10K. USATF-certified—official distances, official results. Double Event option—the ultimate test. Part of the Trivium Mega Medal Series—6 races, 1 giant connecting medal. All paces welcome—run or walk the 5K, test your limits in the 10K, or do both. Perfect spring timing—a one-of-a-kind way to kick off your 2026 racing season. Trivium Michigan Mega Medal Series: Prove It 5K & 10K is the first race in the 2026 Trivium Michigan Mega Medal Series. Each medal features the path of its race and connects to the others, forming one giant, six-piece medal by year's end. Series registration also saves you money on entry fees. 2026 Mega Medal Series lineup: Prove It 5K & 10K, April 18, 2026, Milford, MI; Trenton Summerfest Half Marathon, 8K, & 5K, June 2026, Trenton, MI; Dearborn Decades 5K, August 2026, Dearborn, MI; Run the 313 5K, August 2026, Detroit, MI; Growler Gallop Atwater 10 Mile & 5K, September 2026, Detroit, MI; Black Toenail Friday Half Marathon & 7.5 Miler, November 27, 2026, Commerce Township, MI. Prove It isn’t just another race—it’s your chance to experience Michigan’s car culture, test your fitness, and earn your place on the track. Register today for the Prove It 5K & 10K on April 18, 2026, and start your season with a race you’ll never forget. https://runsignup.com/Race/MI/Milford/ProveIt5k

Dansville, Michigan (United States of America) - "Bigfoot Challenge 5k/8k Memorial Day Run/Walk". The 48th Annual Memorial Day Bigfoot Challenge 5K/8K starts at 8:30 a.m. in the little town of Dansville, where participants can run with Bigfoot. A parade follows the race at 12:00 p.m. All entries receive a T-shirt and a Bigfoot Finishing Medal, with a new patriotic T-shirt design available in two colors; sign up early to guarantee a shirt. Entry fees are $27 until March 16, $29 until April 14, $31 until May 14, and day-of registration is $39 by cash, check, or online sign-up. Family discount codes are available for three or more participants, and participants can run for free by donating $100. The Little Foot race for children 12 and under has an entry fee of $15 in advance and $20 on race day, starting at 8:10 a.m. on the track, with participants receiving a medal and T-shirt. Children can run one or two laps, and Bigfoot will run one lap with the younger kids. Results for the 5K and 8K will be chip-timed and texted to participants, with live results on the website. Age group awards are Bigfoot trophies for the top three finishers in each age group: 12 & under, 13–14, 15–16, 17–18, 19–24, 25–29, 30–34, 35–39, 40–44, 45–49, 50–54, 55–59, 60–64, 65–69, 70–74, 75–79, and 80+. Overall awards for both 5K and 8K include large Bigfoot trophies for male and female winners in Overall, Master (over 40), Grand Master (over 50), and Senior Master (over 60) categories. Awards are self-serve, though overall winners will be announced. Packet pick-up is Sunday night from 6:30–7:00 p.m. at the high school track and on race day starting at 7:00 a.m. at the Dansville High School Track. Proceeds support the Dansville Running Club and running programs at Dansville. More information is available on the registration page. https://runsignup.com/Race/MI/Dansville/BIGFOOTCHALLENGE?raceRefCode=iOOgaVZm&aflt_token=Nktw0AUB3nF4FPeh7Y7AWqQewFdw9sGt

Laingsburg, Michigan (United States of America) - "Summer Trail Fest Ultra 50K, Half Marathon, & 5 Mile". Summer Trail Fest Ultra (STFU) is back for its fifth year on Saturday, June 13, 2026, at Sleepy Hollow State Park in Laingsburg, Michigan. This summer trail race is the perfect mix of beginner-friendly and PR-worthy, with smooth, well-marked singletrack and generous cutoffs that make it accessible for both new and experienced trail runners. Whether you’re ready for your first 50K ultramarathon, looking to nail a faster half marathon, or want to test yourself on the 5-mile trail race, STFU delivers a one-of-a-kind Michigan trail running experience. The course features about 90% well-groomed trails with minimal technical terrain, making it an ideal choice for anyone stepping up to longer trail distances. With 20:00/mile cutoffs for the 50K and 45:00/mile cutoffs for the Half Marathon, you’ll have plenty of time to finish strong. Aid stations are well-stocked with water, electrolytes, gels, and real food options, so you can run without a crew and still be fully supported. After the finish line, the fun doesn’t stop. Stick around for a post-race cookout and BBQ featuring burgers, hot dogs, sides, and plenty of trail camaraderie. In 2026, spectators can even purchase picnic tickets, so your family and friends can join the celebration too. Even better, STFU is the summer counterpart to the February Winter Trail Fest (WTF) Half Marathon & 5 Mile in Brighton and Middleville. Each year, the STFU and WTF medals are designed to magnetically connect into one giant finisher medal. You can also register through the WTF + STFU bundle to save 15% off each race while guaranteeing your spot in both events. Why run STFU? Beginner-friendly trail race with smooth, scenic singletrack, distances for everyone: 50K, Half Marathon, and 5 Mile (run or ruck), generous cutoff times (20:00/mile for 50K, 45:00/mile for Half), well-stocked aid stations so you can run without a crew, excessively well-marked course that keeps navigation stress-free, post-race cookout and BBQ celebration at the finish line, medals that magnetically connect with Winter Trail Fest for a full-season accomplishment, central Michigan location convenient to both east and west sides of the state. Summer Trail Fest Ultra, Half Marathon, and 5 Mile is more than just a race; it’s a celebration of summer trails, community, and the joy of finishing something big. Register today and get ready to STFU and Run on June 13, 2026! https://runsignup.com/Race/Info/MI/Laingsburg/STFUandHalf

Detroit, Michigan (United States of America) - "Run the 313". Come Race the 313! Get ready to lace up and celebrate everything that makes Southeast Michigan’s running scene unforgettable! Run the 313 5K isn’t just a race, it’s a full community experience, hosted in Detroit’s Palmer Park by Trivium Racing and WeRun313. This fast, flat, USATF-certified course is built for everyone: seasoned runners chasing a PR, first-timers stepping up to the start line, families with strollers, and kids soaking up the race-day magic. And the celebration doesn’t end when you cross the finish line. Stick around and enjoy the post-race hype, music, community vibes, recovery and cool-down opportunities, and all the energy you’ve come to expect from WeRun313 and Trivium’s biggest Detroit event of the year. Plus, custom race swag, great awards, and plenty of reasons to hang out with your people. Don’t miss out on one of Detroit’s most uplifting race-day traditions. Let’s make 2026 the best year yet! https://runsignup.com/Race/MI/Detroit/Runthe313