All-Out Mardi Crawl Arvada, CO   Feb 22, 2026

Welcome to the annual All-Out Mardi Crawl, benefiting Firefly Autism! 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 gentle half marathon course around Long Lake Regional Park. With its Endless Series counterpart Runapalooza, this is a can’t-miss opportunity to enjoy much of what Colorado has to offer! And don’t forget to dress in your Mardi Gras best for the costume contest!