Welcome to the 10th annual All-Out Mardi Crawl, a Mardi Gras run in the Denver area! From the award winning Apex Center, these 5K, 10K & Half Marathon courses will run west along the 2020 Best of the Best Ralston Creek Trail through Arvada's open spaces and stunning golf course communities, shady, creekside beauty and a challenging half marathon loop around Blunn reservoir. With its Endless Series counterpart Runapalooza, this is a can't miss opportunity to enjoy much of what Colorado has to offer!