Curated races, clubs, and training

MarathonThe full 26.2 Half Marathon13.1 miles of fun 5KShort and fast 10KThe classic distance TrailGet off the pavement RoadPavement classics Ultra50K, 100K, and beyond FlatFast, PR-friendly courses DownhillNet elevation drop RelayRun as a team VirtualRun anywhere, anytime CoastalRun along the shoreline MountainHigh-altitude challenges

5KShort and fast 10KThe classic distance Half Marathon13.1 miles of fun MarathonThe full 26.2 50KYour first ultra 50 MileThe long haul 100KUltimate endurance 100 MileThe ultimate challenge

All trail racesGet off the pavement Mountain TrailsAlpine singletrack Coastal TrailsOcean views on foot Hilly TrailsRolling terrain off-road Flat TrailsSmooth and fast off-road Trail Ultras50K+ off-road Trail 50KFirst ultra on dirt Trail Marathon26.2 off-road Trail Half13.1 off-road

All road racesPavement classics Road MarathonClassic 26.2 on pavement Road Half13.1 on the roads Road 10K6.2 miles on pavement Road 5KFast 3.1 on the roads Flat RoadPR-friendly road courses Downhill RoadNet downhill road courses City RoadUrban road events

United StatesRaces across America Boston, MAHistoric running city New York, NYThe five boroughs Chicago, ILFlat and fast Los Angeles, CAWest coast running San Francisco, CAHills and views Denver, COMile high racing Portland, ORPacific Northwest Seattle, WAEmerald city runs Austin, TXTexas running scene Nashville, TNMusic city miles San Diego, CAYear-round sunshine Miami, FLTropical running Honolulu, HIIsland paradise runs Washington, DCMonument runs Salt Lake City, UTMountain valley racing Boulder, CORunner's paradise Bend, ORTrail town USA Asheville, NCBlue Ridge running Duluth, MNNorth Shore trails Charleston, SCSouthern charm runs Savannah, GALive oak lined routes Santa Fe, NMHigh desert art town Key West, FLSouthernmost runs Maui, HIVolcanic island trails Napa Valley, CAWine country running

FlatFast, PR-friendly courses RollingGentle hills throughout HillySignificant climbs MountainousMajor elevation challenges DownhillNet elevation drop CoastalRun along the shoreline MountainHigh-altitude challenges ValleyBetween the peaks IslandSurrounded by water CanyonDeep and dramatic DesertArid and exposed

OceanRun along the ocean LakePeaceful lake views RiverFollow the water BayHarbor and bay views WildernessDeep backcountry RuralQuiet country roads CityUrban energy LoopStart and finish together Point to PointA to B adventures Out & BackThere and back again

Turkey TrotThanksgiving weekend runs New Year'sStart the year running July 4thIndependence Day runs Valentine'sRun with your sweetheart St. Patrick'sLucky runs in green HalloweenSpooky season runs Memorial DayHonor and run ChristmasHoliday season runs Labor DayEnd-of-summer runs Mother's DayRun for mom Father's DayRun for dad Cinco de MayoFiesta runs MLK DayDream runs

YosemiteSierra Nevada running Grand CanyonRim-to-rim adventures ZionRed canyon trails YellowstoneGeothermal wilderness Big SurCoastal California SedonaRed rock running MoabDesert ultra country Lake TahoeAlpine lake running AcadiaNortheast coastal trails GlacierCrown of the continent Death ValleyExtreme desert running Joshua TreeHigh desert trails Rocky MountainAlpine trail running OlympicRainforest to coast Bryce CanyonHoodoo trails Great Smoky MountainsAppalachian running LeadvilleRace across the sky Mount RainierVolcanic peak trails Pictured RocksGreat Lakes shoreline

RelayRun as a team VirtualRun anywhere, anytime WalkingWalk-friendly events TrackOn the oval GrassSoft underfoot SandBeach running MixedVariety of terrain LapsMultiple loops

Boston, MAHistoric running city New York, NYThe five boroughs Chicago, ILFlat and fast Los Angeles, CAWest coast running San Francisco, CAHills and views Denver, COMile high racing Portland, ORPacific Northwest Seattle, WAEmerald city runs Austin, TXTexas running scene Nashville, TNMusic city miles San Diego, CAYear-round sunshine Miami, FLTropical running Honolulu, HIIsland paradise runs Washington, DCMonument runs Salt Lake City, UTMountain valley racing Boulder, CORunner's paradise Bend, ORTrail town USA Asheville, NCBlue Ridge running Duluth, MNNorth Shore trails Charleston, SCSouthern charm runs Savannah, GALive oak lined routes Santa Fe, NMHigh desert art town Key West, FLSouthernmost runs Maui, HIVolcanic island trails Napa Valley, CAWine country running United StatesRun clubs across United States

Solutions Pricing About Blog Developers Brand Terms Privacy

© 2026 Intervals

Races Clubs Train Wrapped

Muddy Shamrock @ The Forge — Lemont, IL

Races
United States
Illinois
Aurora, IL
Muddy Shamrock @ The Forge

Half Marathon 10K Trail Trail Half St. Patrick's

Muddy Shamrock @ The Forge

Saturday, March 13, 2027Lemont, IL10K – Half Marathon

Get ready for an adventurous early-season challenge at the 6th annual Muddy Shamrock Trail Races. This event takes runners through the scenic woods of the historic Lemont Quarries, featuring a mix of single-track and double-track trails. You will navigate through technical terrain including dirt, mud, and roots as you traverse the Forge's MTB trails and surrounding gravel paths. Now in its fourth iteration under this branding, the race offers a rugged experience for those who love getting off the beaten path. Expect a dynamic course that tests your agility and endurance amidst beautiful natura...

Races

Surface

Trail

Temperature

Mild

Setting

Hills

Area

Town

Frequently asked questions

Location

227 Heritage Quarries Dr.

Lemont, IL 60439

Not affiliated with this event. Official website. We may earn a commission on registrations.

Mar 139:00 AM

Shirt

$50

$60 after Oct 14

Mar 139:00 AM

Shirt

$50

$60 after Oct 14

More races near Lemont

CandleLight 12/24 Hour - Overnight Ultra and Relays

24 Hour24 Hour with personalized BIB12 Hour Overnight+3

Yarmouth Clam Festival Kids Fun Race

1/2 Mile Run for Ages 3-6 *THIS IS NOT A TIMED RACE*1 Mile TIMED Run for Ages 7-12

Annual OVL Cape Cod 5K Championship Road Race - "Run for the Library"

5K2026 OVL Annual Cape Cod 5K Championship Road Race - "RUN FOR THE LIBRARY" - Children Under 10

Miles for Migraine Massachusetts

Big Bang Mile and Science Festival

1 MilesMasters Women (ages 40-49) Mile

Sun and Sand 5K

North Wildwood, NJ

Half Marathon Training Program

Spring Lake, NJ

Half Marathon Training Program

Hunger Hero 5k: The 250th Anniversary Special

Full Moon 25k/50k

31.07 Miles15.53 Miles

Alaska Salmon Runs

26.2 Miles13.1 Miles6.2 Miles+2

13th Annual Nicholas Fillinger Memorial Run

Eagle 5K, 10K, & 13.1M at Mobile, AL (29)

5K10K13.1 Miles