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| Month | Race Name | Events | Location | Near | |
| February | Squamish Scrambler Snowshoe Run | 22 km, 10 km | BC, Canada | Squamish | |
| February | Pemberton Trail 50K | 50 km | AZ, United States | Fountain Hills | |
| February | Beaver Creek Snowshoe Series Race #2 | 10 km, 5 km | CO, United States | Beaver Creek | |
| February | Capilano Canyon Night Run - Mardi Gras | 18 km, 12 km | BC, Canada | North Vancouver | |
| February | Little Su 50K | 50 km | AK, United States | Big Lake | |
| February | Susitna 100 | 100 mi | AK, United States | Big Lake | |
| February | Black Warrior 50K | 50 km, 25 km | AL, United States | Moulton | |
| February | Cross Timbers Trail Run | 50 mi, 26.2 mi, 13.1 mi, 5 mi | TX, United States | Lake Texoma | |
| February | Mount Cheaha 50K | 50 km | AL, United States | Delta | |
| February | Woodside Kings Mountain Half Marathon & 5 Mile | 13.1 mi, 5 mi | CA, United States | Woodside | |
| February | Flatwoods Ramble | 10 mi, 5 km | FL, United States | Tampa | |
| February | Louisville's Lovin' The Hills 50K and 15 miler | 50 km, 15 mi | KY, United States | Louisville | |
| February | Rocky Raccoon 100 | 100 mi, 50 mi | TX, United States | Huntsville | |
| February | Sylamore Trail 25K / 50K | 50 km | AR, United States | Allison | |
| February | Psycho Wyco Run Toto Run | 50 km, 20 mi, 10 mi | KS, United States | Kansas City | |
| February | Destin 50 Beach Ultra | 100 mi, 50 mi, 50 km | FL, United States | Destin | |
| February | Bandit Ultra Trail Run | 50 km | CA, United States | Simi Valley | |
| February | Mount Mitchell Challenge and Black Mountain Marathon | 40 mi | NC, United States | Black Mountain | |
| February | Gettin Hitched Valentines 5K | 5 km | CA, United States | San Diego | |
| February | Love. Run. Marathon | 26.2 mi, 13.1 mi, 10 km | TX, United States | Huntsville | |
| February | Mud in Your Eye XC Series 3 | 8 km | VA, United States | Norfolk | |
| February | Mill Stone 50K | 50 km | SC, United States | Fort Mill | |
| February | Winter Splash 8 Miler and 5K | 8 mi, 5 km | NC, United States | Spruce Pine | |
| February | Viking Winter Dash Indiana | 15 mi, 13.1 mi, 10 km, 5 km | IN, United States | New Castle | |
| February | Bay Breeze Half Marathon/10K/5K | 13.1 mi, 10 km, 5 km | CA, United States | Fremont | |
| February | Hellyer Half Marathon/10K/5K | 13.1 mi, 10 km, 5 km | CA, United States | San Jose | |
| February | Lone Star 100 | 100 mi, 100 km | TX, United States | El Paso | |
| February | Fragrance Lake Half and 10K | 13.1 mi, 10 km | WA, United States | Bellingham | |
| February | Olde Girdled Grit 50K | 50 km | OH, United States | Cleveland | |
| February | Frozen Feet Night | 5 km | MN, United States | Champlin | |
| February | Frozen Feet Run | 13.1 mi, 10 km, 5 km | MN, United States | Champlin | |
| February | Welsh Mtn Trail Run | 30 km, 15 km | PA, United States | New Holland | |
| February | Old Man Winter Rally | 10 km | CO, United States | Lyons | |
| February | Mt. Umunhum Trail Conquest | 50 km, 26.2 mi, 30 km, 13.1 mi, 7 mi, 5 km | CA, United States | San Jose | |
| February | Quarry Lakes Family 5K and 10K | 10 km, 5 km | CA, United States | Fremont | |
| February | Love on the Rocks 5K & 10K Team Challenge | 10 km, 5 km | CA, United States | Chico | |
| February | Viking Dash: Indiana | 13.1 mi, 15 km, 10 km, 5 km | IN, United States | Muncie | |
| February | Jackalope Jam | 100 mi, 100 km, 50 mi, 26.2 mi | TX, United States | Houston | |
| February | Happy Trails Ranch Park | 10 km, 5 km | TX, United States | Dripping Springs | |
| February | Moab's Red Hot Ultra | 50 mi, 55 km, 33 km, 15 km | UT, United States | Moab | |
| February | Grace Creek Grinder | 100 mi, 100 km, 2.5 mi | TX, United States | Longview | |
| February | Dirty South Trail Half Marathon and Marathon | 26.2 mi, 13.1 mi | TN, United States | Knoxville | |
| February | Dry Creek Trail Races | 26.2 mi, 13.1 mi, 10 km | TN, United States | nashville | |
| February | Powder and Porters Winter Trail Run | 4.5 mi | CO, United States | Evergreen | |
| February | The POSTOAK Lodge Challenge | 50 km | OK, United States | Tulsa | |
| February | Natural Bridge Caverns Trail Run | 13.1 mi, 10 km, 5 km | TX, United States | Garden Ridge | |
| February | Frozen Chosin | 6 mi | OH, United States | Jackson | |
| February | Friends of Seminole State Forest Run for the Woods | 13.1 mi, 12 km, 5 km | FL, United States | Sorrento | |
| February | Old Man Winter Bike Rally and Run | 10 km, 5 km | CO, United States | Lyons | |
| February | North Texas Ultra | 100 km, 50 km, 25 km, 10 km | TX, United States | Jacksboro | |
| February | Arbuckle 100 | 100 mi, 50 mi, 10 km | OK, United States | Davis | |
| February | Yonah Mountain Vertical Challenge | 75 km, 50 km, 25 km | GA, United States | Cleveland | |
| February | Groundhog Grind Trail Run | 10 km, 10 km, 5 km, 5 km | IA, United States | Mitchellville | |
| February | Running Up for Air - Granduer Peak | 0 mi | UT, United States | Salt Lake City | |
| February | Running Up for Air - Mt Sentinel | 0 mi | MT, United States | Missoula | |
| February | Ranch to Ranch 2,5,10,15K Trail Run | 15 km, 10 km, 5 km, 2 km | CA, United States | Alpine | |
| February | Running Up for Air - Staunton Rocks | 0 mi | CO, United States | Pine | |
| February | Running Up for Air - Malans Peak | 0 mi | UT, United States | Ogden | |
| February | Yeti Trail Half | 13.1 mi | IN, United States | Westville | |
| February | Cereal Killer 15k Trail Run | 15 km | IN, United States | La Porte | |
| February | Groundhog's Lap Race | 12 mi, 12 mi, 6 mi, 3 mi | NC, United States | Greensboro | |
| February | Winter Trail Fest (WTF) 13.1 & 5 Mile Eastside | 13.1 mi, 5 mi | MI, United States | Brighton | |
| February | Winter Trail Fest (WTF) 13.1 and 5 Mile Westside | 13.1 mi, 5 mi | MI, United States | Middleville | |
| February | River to Clouds Trail Run | 100 mi, 50 mi, 27 mi, 25 mi, 25 mi | TN, United States | Chattanooga | |
| February | Run The Pines - Faulkner Park | 25 km, 16 km, 8 km | TX, United States | Tyler | |
| February | OUTLAST SAN ANTONIO | 18 mi | TX, United States | San Antonio | |
| February | OUTLAST NACOGDOCHES | 36 mi, 18 mi | TX, United States | Nacogdoches | |
| February | Goliath's 50 | 50 mi, 50 km, 20 mi, 10 mi, 10 mi, 10 km, 5 km | TX, United States | Killeen | |
| March | Prickly Pear | 50 km, 10 mi | TX, United States | San Antonio | |
| March | Antelope Island Buffalo Run 50 Mile/50K/25K | 50 mi, 50 km, 25 km | UT, United States | Syracuse | |
| March | Hinte-Anderson Trail (HAT) Run | 50 km | MD, United States | Aberdeen | |
| March | Foot Pursuit 5K | 5 km | IN, United States | Valparaiso | |
| March | Beaver Creek Snowshoe Series Race #3 | 10 km, 5 km | CO, United States | Beaver Creek | |
| March | Land Between the Lakes Ultra Trail Runs | 50 mi, 60 km, 26.2 mi, 23 km | KY, United States | Grand Rivers | |
| March | Laughlin Half Marathon & 5K | 13.1 mi, 5 km | NV, United States | Laughlin | |
| March | Marin Trail 10K & 20K | 20 km, 10 km | CA, United States | San Rafael | |
| March | Way Too Cool 50K | 50 km | CA, United States | Cool | |
| March | Catalina Marathon | 26.2 mi, 10 km, 5 km | CA, United States | Avalon | |
| March | Romancing the Island | 25 km, 12 km | CA, United States | Tiburon | |
| March | Spring Mountain Highway Madness | 60 km, 45 km, 30 km, 15 km | BC, Canada | North Vancouver | |
| March | Napa Valley Trail Marathon, Half Marathon & 10K | 26.2 mi, 13.1 mi, 10 km | CA, United States | Calistoga | |
| March | Burnaby Mountain Run | 22.4 km, 11.2 km | BC, Canada | Burnaby | |
| March | Bel Monte Endurance Run | 50 mi, 50 km, 25 km | VA, United States | Charlottesville | |
| March | Terrapin Mountain 50K & 1/2 Marathon | 50 km, 13.1 mi | VA, United States | Sedalia | |
| March | Napa Valley Half marathon | 13 mi | CA, United States | Napa | |
| March | Diablo Trails Challenge | 32.1 mi | CA, United States | Walnut Creek | |
| March | INTO THE WILD OC TRAIL RUN 10k/21k | 21 km, 10 km | CA, United States | Orange County | |
| March | Spring Run for Fun at Redmond Watershed | 26.2 mi, 13.1 mi, 10 mi, 5 mi | WA, United States | Redmond | |
| March | The Rat Race | 10 km | NJ, United States | Waretown | |
| March | Coyote Lake 5K, 10K, 15K Trail Run | 15 km, 10 km, 5 km | CA, United States | San Jose | |
| March | The Instant Classic Marathon Trail Run | 26.2 mi | VA, United States | Richmond | |
| March | Double Top 100 | 100 mi, 100 km | GA, United States | Chatsworth | |
| March | Woodside Ramble | 50 km, 36 km, 13.1 mi, 10 km | CA, United States | Woodside | |
| March | Prairie Spirit 50/100 mile | 100 mi, 50 mi | KS, United States | Ottawa | |
| March | 24 Hours of Utah...The Run/Moab 100 | 100 mi, 50 km | UT, United States | Moab | |
| March | Antelope Island Buffalo Run 100 Mile | 100 mi | UT, United States | Syracuse | |
| March | Dances with Dirt Green Swamp | 50 mi, 50 mi, 50 km, 26.2 mi, 13.1 mi, 10 km | FL, United States | Tampa | |
| March | Seamus Scramble 5K & 5 Mile | 5 mi, 5 km | WI, United States | West Bend | |
| March | Marin Trail 10K & 20K - Runner Reports | 20 km, 10 km | CA, United States | San Rafael | |
| March | Romancing the Island - Runner Reports | 25 km, 12 km | CA, United States | Tiburon | |
| March | Buzzard Day Trail Race 25/50/100K | 100 km, 50 km, 25 km | OH, United States | Cleveland | |
| March | Coyote Backbone Trail Ultra | 100 mi, 68 mi | CA, United States | Mugu State Park | |
| March | Ramblas Run | 13 mi, 10 km, 5 km | CA, United States | Orange County | |
| March | Crazy Desert Trail Race | 100 km, 50 km, 13.1 mi, 10 km, 5 km | TX, United States | San Angelo | |
| March | Badger Cove Half Marathon/10K/5K | 13.1 mi, 10 km, 5 km | CA, United States | Livermore | |
| March | Brazen Goonies Half Marathon/10K/5K | 13.1 mi, 10 km, 5 km | CA, United States | Vacaville | |
| March | Haulin' in the Holler | 50 km, 25 km, 5 km | WV, United States | Eleanor | |
| March | PipeLine 13 & 26 Mile Trail Run | 26 mi, 13 mi | PA, United States | Elverson | |
| March | Special 13 and 26 mile Trail Run | 26 mi, 13 mi | PA, United States | Lancaster | |
| March | Antelope Island Buffalo Run 50 Mile/50K/25K - Runner Reports | 50 mi, 50 km, 25 km | UT, United States | Syracuse | |
| March | Stewart Mountain Half Marathon | 13.1 mi | WA, United States | Bellingham | |
| March | Griffith Park Trail Marathon | 26.2 mi | CA, United States | Hollywood | |
| March | True to the Brew 10k | 10 km | SC, United States | Columbia | |
| March | Sanborn Trail Challenge | 13.1 mi, 8 mi, 4 mi | CA, United States | Saratoga | |
| March | Folsom Lake Southside Trail Run | 50 km, 21 mi, 13.1 mi, 9 mi, 10 km, 5 km | CA, United States | Folsom | |
| March | South Hills Single Track Trail Run | 50 km, 26.2 mi, 16 mi, 13.1 mi, 9 mi, 10 km, 5 km | CA, United States | San Jose | |
| March | TRAIL TRASHED | 100 mi, 50 mi, 26.2 mi, 13.1 mi, 10 km, 5 km, 1 mi | NV, United States | Las Vegas | |
| March | Spring Backyard Burn 5M/10M Trail Running Series-Race #1 | 10 mi, 5 mi | VA, United States | Annandale | |
| March | Spring Backyard Burn 5M/10M Trail Running Series-Race #2 | 10 mi, 5 mi | VA, United States | Clifton | |
| March | San Felipe Shootout | 22.4 mi, 13.1 mi, 6.2 mi, 3.1 mi | TX, United States | San Felipe | |
| March | Behind the Rocks Ultra | 50 mi, 50 km, 30 km, 10 mi | UT, United States | Moab | |
| March | Grasslands Trail Run | 50 mi, 26.2 mi, 13.1 mi | TX, United States | Decatur | |
| March | Tesoro Viejo Spring Classic Half Marathon | 13.1 mi | CA, United States | Madera | |
| March | Wild Awakening | 4 mi | IL, United States | Palatine | |
| March | Looney Leprechaun Trail Race | 20 km, 10 km | PA, United States | Newtown | |
| March | Tombstone 30k/50k Trail Run | 50 km, 30 km | IN, United States | Valparaiso | |
| March | Ramble In The Brambles | 29 mi, 19 mi, 9 mi, 5 km | TX, United States | Muenster | |
| March | False Spring Trail Runs | 20 km, 10 km | IN, United States | LaPorte | |
| March | Green Monster | 2 mi | VA, United States | Danville | |
| March | St. Patrick's TREK | 10 km, 5 km | TX, United States | Denison | |
| March | Northern Trails Trail Race | 17 mi, 10 mi, 5 mi | NC, United States | Greensboro | |
| March | Viper 300 | 300 mi, 200 mi, 100 mi, 53 km, 25 km | TN, United States | Memphis | |
| March | Umstead Trail Marathon | 26.2 mi | NC, United States | Raleigh | |
| March | Frio Trail Runs | 50 km, 30 km, 20 km, 10 km, 10 km, 5 km | TX, United States | Concan | |
| March | Red White & Ruck Nash | 0.8 mi, 0.8 mi, 0.8 mi, 0.8 mi, 0.8 mi, 0.8 mi, 0.8 mi, 0.8 mi, 0.8 mi | TN, United States | Arrington | |
| March | Chupacabra 50 | 50 mi, 53 km, 20 km, 9 km, 9 km | TX, United States | Quanah | |
| March | Run The Pines - Lindsey Park | 30 km, 20 km, 10 km | TX, United States | Tyler | |
| March | OUTLAST NASHVILLE | 18 mi | TN, United States | nashville | |
| March | Harepin Hustle Trail Run | 13.1 mi, 10 km | NC, United States | Morrisville | |
| March | OUTLAST BLUE RIDGE | 18 mi | NC, United States | Mill Spring | |
| March | Robinson Preserve Twilight 5K & 10K | 10 km, 10 km, 5 km, 5 km, 1 mi | FL, United States | Bradenton |
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