| Date | Name | Type | Race | City |
|---|---|---|---|---|
| TakeAim Cycling Skills Clinics with Trailwerks Cyclery Apr 26 to Apr 26 | Race | Annapolis, MD | ||
| Downhill Southeast Massanutten Apr 27 to Apr 27 | Race | Harrisonburg, VA | ||
| Cognition Women's MTB Skills Clinic Apr 27 to Apr 27 | Race | Doylestown, PA | ||
| Hardware XC - PA State Championship Apr 27 to Apr 27 | Race | Scranton, PA | ||
| MMCC's Rust Shaker Apr 27 to Apr 27 | Race | Harrison, NY | ||
| Cohutta 100 (NUE Series) Apr 27 to Apr 27 | Race | Ducktown, TN | ||
| Big Frog 65 (NUE series) Apr 27 to Apr 27 | Race | Ducktown, TN | ||
| Old Copper 20 Apr 27 to Apr 27 | Race | Ducktown, TN | ||
| Beezley Burn Apr 27 to Apr 27 | Race | Ephrata, WA | ||
| Whiskey Off-Road featured Apr 27 to Apr 29 30 miles route w/ 4,854 ft climb | Race | Prescott, AZ country | ||
| CDT Trail Days 2018 Apr 27 to Apr 29 | Trail Day | Silver City, NM state | ||
| Orchard Hill Assault Apr 28 to Apr 28 | Race | Amherst, MA | ||
| The Battle at Burlingame - Mountain Bike Cross Country Classic & 6 Hour Endurance Race Apr 28 to Apr 28 | Race | charlestown, NH | ||
| Beaver Blitz VORS #5 Apr 28 to Apr 28 | Race | Earlysville, VA | ||
| CA DIRT MTB SERIES-R2-Hallelujah on 04/29/18 Apr 28 to Apr 28 | Race | Nevada City, CA | ||
| RK6 Endurance Event Apr 28 to Apr 28 | Race | Canyon, TX | ||
| Dirt Series Mountain Bike Camp - Los Gatos, CA Apr 28 to Apr 29 | Clinic/Camp | XC | Los Gatos, CA state | |
| SoCal Enduro #2 Apr 28 to Apr 28 | Race | Enduro | Temecula, CA region2 | |
| The 29th Annual Yankee Springs Time Trial | Race | Middleville, MI | ||
| Siskiyou Challenge | Race | Downhill | Ashland, OR state | |
| Stowe Trails Partnership 2018 Annual Meeting Apr 28 to Apr 28 | Meeting | Stowe, VT region2 | ||
May | ||||
| Farmall Hill Mountain Bike Challenge | Race | XC | Fairport, NY | |
| Bikerpelli 2018 May 2 to May 2 | Race | Fruita, CO | ||
| Iron Furnace 50/25K a MASS Endurance Event May 4 to May 4 | Race | Vernon, NJ | ||
| Carolina Endurance Series-MTB #2 May 4 to May 4 | Race | Myrtle Beach, SC | ||
| Ridgeline Rampage - Saturday May 5th May 4 to May 4 | Race | Castle Rock, CO | ||
| Family Funduro II May 4 to May 4 | Race | Johnson City, TN | ||
| Fruita Fat Tire Festival May 4 to May 6 | Festival | Fruita, CO country | ||
| Soldier Hollow Pro XCT + UCI Junior Series XCO May 5 to May 5 | Race | XC | Independence, KS country | |
| Wallum Lake Mountain Bike Race May 5 to May 5 | Race | Douglas, MA | ||
| Counties of Bath & Alleghany Middle Mountain Momma May 5 to May 5 | Race | Millboro, VA | ||
| The White Oak 66er 6 Hour Mountain Bike Race May 5 to May 5 | Race | Weston, WV | ||
| SoCal Enduro #4 May 5 to May 5 | Race | Enduro | Los Olivos, CA state | |
| Fort Custer Stampede May 5 to May 5 | Race | Augusta, GA | ||
| Scott Enduro Cup - Moab May 5 to May 5 | Race | Enduro | Moab, UT | |
| Scott Enduro Moab May 5 to May 5 | Race | Moab, UT | ||
| Soldier Hollow Pro XCT May 5 to May 5 | Race | XC | Midway, UT country | |
| The Salida 720 May 5 to May 5 | Race | XC | Salida, CO state | |
| Race The Trails - Six pack #3 May 5 to May 5 | Race | Amarillo, TX | ||
| Dirt Series Mountain Bike Camp (co-ed) - Santa Cruz, CA May 5 to May 6 | Clinic/Camp | XC | Santa Cruz, CA state | |
| Ridgeline Rampage 16 miles route w/ 2,478 ft climb | Race | XC | CO state | |
| Crooked Creek Trail Build Weekend | Trail Day | Nashville, IN | ||
| SCOTT Enduro Cup - Moab May 5 to May 5 | Race | Enduro | Moab, UT state | |
| Spring Trail Work Day 2018 May 5 to May 5 | Trail Day | Stowe, VT region2 | ||
| Oregon Coast Gravel Epic p/b Oregon Coast Bank | Race | Waldport, OR state | ||
| USA National Championships - XCM May 6 to May 6 | Race | XC | Independence, KS country | |
| CCAP School Short Track Series #3 Berlin May 8 to May 8 | Race | Berlin, CT | ||
| Farmall Hill Mountain Bike Challenge | Race | XC | Fairport, NY | |
| Wawarsink Spring Klassic May 11 to May 11 | Race | Wawarsing, NY | ||
| Big Creek Quick Six Enduro May 11 to May 11 | Race | Roswell, GA | ||
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