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Mar 2–8
Northern Trails Marathon·Albany Combos Marathon·Umstead Trail Marathon·Myrtle Beach Marathon·Cross Timbers Trail Run·Hachie 50 Marathon, Ultra and Relay·Seneca Creek Greenway Trail Marathon·Sand Hollow Marathon·Labor of Love Marathon·EDP Half Marathon of Lisbon·Great Welsh Marathon·Zydeco Marathon·Los Angeles Marathon
Mar 9–15
Land Between the Lakes Marathon·Catalina Island Marathon·Run Through Time Marathon·Des Moines St. Paddys Marathon·Seabrook Lucky Trail Marathon·New Bedford Half Marathon·United Airlines NYC Half·St. Patty's 5k, Half & Marathon (Georgetown)·Barcelona Marathon·Tobacco Road Marathon·Big Island International Marathon·Bound for Boston Marathon (Las Vegas)·Pistol Creek Run Marathon
Mar 16–22
Run the Rainbow for Children's Marathon·Holyoke St. Patricks Day Road Race·Blue Bell Fun Run·Buzz Marathon·Grasslands Trail Run Marathon·Asheville Marathon·Bataan Memorial Death March Marathon·Napa Valley Trail Marathon·Heroes of America Marathon·Two Rivers Marathon (Saturday)·Rome Marathon·Shamrock Marathon·Oakland Marathon·Modesto Marathon·Virginia Marathon·Two Rivers Marathon (Sunday)·Bakersfield Marathon
Mar 23–29
Griffith Park Trail Marathon·Prague Half Marathon·Cooper River Bridge Run·Rend Lake Marathon·Yakima River Canyon Marathon·Savin Rock Marathon·Mission Run in the Ozarks·REVEL Mt. Charleston Marathon·McKirdy Micro Marathon: Breaking 3·Weir Venloop Half Marathon·Berlin Half Marathon·Queens Marathon - Spring·Chattanooga Marathon·B&A Marathon·Fort Smith Marathon·Irving Marathon·ORRRC Xenia Marathon·The Trailbreaker·Mill Town Marathon (WA)·McKirdy Micro Marathon: MicrOTQ - Road to Tokyo
Mar 30–Apr 5
Crescent City Classic 10K·Raquette River Marathon·Salisbury Marathon·Golden Gate Headlands Marathon·Cheap Marathon·New South Trail Marathon·Andrew Jackson Marathon
Apr 6–12
Cherry Blossom 5K·Charlottesville Marathon·Victory Marathon·Bedrock Valley Trail Runs·Martian Marathon·Horse Capital Marathon·Milwaukee Marathon·Spring Chance BQ.2 Marathon (Geneva, IL)·London OH Marathon·Philadelphia Trail Marathon·Hogeye Marathon·GO! St. Louis Marathon·Albuquerque Marathon·Coffee Milk Half Marathon·Carlsbad 5000·Milano Marathon·Cherry Blossom 10 Mile·Brighton Marathon (UK)·London Landmarks Half Marathon·Hannover Marathon·Virginia Creeper Marathon·Vernonia Marathon·Rotterdam Marathon·Coast Guard Marathon·Knoxville Marathon·Paris Marathon·Bend Marathon·Coastal Delaware Running Festival Marathon·Millbrook Marathon
Apr 13–19
Boston 5K·Helenback Marathon·Eisenhower Marathon·Bremberton Marathon·Blue Ridge Marathon·Carmel Marathon·Brew City Marathon·Wenatchee Marathon·Golden Driller Marathon·Run the River Marathon·Pine Line Marathon·Horseshoe Lake Trail Run·Newport Rhode Races Marathon·PZU Cracovia Marathon·Vienna City Marathon·Nice Half Marathon·Istanbul Half Marathon·Delaware Marathon·Jersey City Marathon and Half Marathon·Athens Marathon·Mountains 2 Beach Marathon·Connemara International Marathon·Manchester Marathon (UK)
Apr 20–26
Boston Marathon·St. Lawrence Marathon·Frisco Railroad Run·Wisconsin Marathon·Mo Marathon·Garmin Olathe Marathon·Illinois Marathon·Salt Lake City Marathon·Salt Lake City Half Marathon·Kentucky Derby Festival Marathon·The Non Cancelled Marathon·Runs With Scissors Races·Thelma and Louise Marathon and Half·Potawatomi Trail Marathon·Rock n Roll Nashville Marathon·Alexander The Great Marathon·Whidbey Island Marathon·TCS World 10K·Marathon de Nantes·Blackpool Marathon·Rock n Roll Madrid Marathon·Brooklyn Half Marathon·Gettysburg North-South Marathon·Mississauga Marathon·Maui Marathon·Big Sur International Marathon·Jim Thorpe Marathon·Glass City Marathon·Hamburg Marathon·Oklahoma City OKC Memorial Marathon·Eugene Marathon·Gopher Attack Marathon·2Slow4Boston Marathon·Kalamazoo Marathon·London Marathon
Apr 27–May 3
Wild West Marathon & Ultra·Texas Switchback Trail Race·Brainerd Jaycees Run for the Lakes Marathon·Potomac River Run Marathon·Miwok 100K·OneAmerica 500 Festival Mini-Marathon·Shiprock Marathon·La Crosse Marathon·IronHorse Marathon·Great Allegheny Ohiopyle Marathon·Stramilano Run Generation·Walter Childs Marathon·York Marathon·Maas Marathon De La Basse-Meuse·Great Limerick Run·Lilac Bloomsday 12K·Great Birmingham Run·Georgina Spring Fling Marathon·Eau Claire Marathon·Chicagoland Spring Marathon·Tacoma City Marathon·Pittsburgh Marathon·Belfast City Marathon·Avenue of the Giants Marathon·Cincinnati Flying Pig Marathon·OC Marathon·Toronto GoodLife Marathon·Colorado Marathon·Vancouver Marathon·Long Island Marathon·Lincoln Marathon·Maine Coast Marathon·Hudson Valley Marathon