Halloween morning in Casper has a rhythm to it that has nothing to do with porch lights and everything to do with trail markers. At 8 a.m. on Saturday, October 31, 2026, the half marathoners leave the Tate Pumphouse first, heading west along the North Platte River. Half an hour later the 10K and 5K fields follow, and at 9 a.m. the smallest competitors — superheroes, witches, a few ghosts, probably at least one dinosaur — take off east from the pumphouse and come back for the Kids' 1K Candy Crawl, which runs until 11 a.m. and costs nothing to enter.
The morning is a joint production of two Casper running institutions: the Casper Windy City Striders, the city's long-standing nonprofit run club, and Run Wyld Wyoming, a younger event-management outfit that has built its reputation on family-friendly gatherings with a bit of spectacle. The Striders handle the longer distances; Run Wyld brings the 5K, dressed up in what the organizers describe as "true Run Wyld fashion," with inflatable decorations stationed along the course. Costumes are encouraged across the board, and there is a costume contest for anyone who wants to be judged on more than their split times.
The setting is part of the appeal. The Tate Pumphouse is a historic brick structure that once served as a pumping station, sending water to the town of Midwest and the Salt Creek oil field. BP gifted the building to the Platte River Trails Trust in 2007, and it was renovated into a community gathering place with public restrooms and the Trust's offices, sitting at the Casper Whitewater Park beside the Newell B. Sargent Foundation Bridge. The trail system it anchors has its own long history: the idea of reclaiming Casper's river corridor for a pedestrian path began in 1968 with a city-appointed steering committee, and the Platte River Trails Trust was incorporated in 1982, the same era in which the Striders themselves took shape. The Trust has since built more than ten miles of river trail, a trails center, and two miles of rail-trail, linking ten city parks along the North Platte.
Race organizers lean on that geography. According to the event listing, 99 percent of the course runs on the Platte River trails with only two road crossings. The 5K loops around Three Crowns, the golf course built on the remediated Amoco refinery site along the river, in a circuit familiar to anyone who has run the club's Thanksgiving Turkey Trot. The 10K goes around Three Crowns and then into the woods past the water treatment plant in Mills before turning back, with a minimal aid station at the turnaround — and, the listing notes with a straight face, "We've heard of some spooky creatures in those woods." The half marathon follows the trail out to Paradise Valley Park and back along the same route, with a well-stocked aid station at the far turnaround in addition to the 10K's smaller one.
It is a deliberately unhurried kind of race. Times are not chip-recorded; an official clock marks the gun start. Runners and walkers of every ability are welcome, as are dogs and strollers, and children under 12 must run with an adult. The course stays open until noon. Day-of registration runs from 7:15 to 8 a.m. at the pumphouse, and the club asks that even the free kids' run be registered in advance so waivers are on file.
The candy crawl has its own logistics. Kids collect free candy from local businesses along the route, and the first 100 children receive a bag to carry it in. It is the sort of detail that tells you who this event is really for — not the runners chasing a personal record, but the families looking for a way to spend Halloween morning outdoors before the evening's trick-or-treating begins.
The Striders' role here fits a pattern the club has followed for four decades. Formed around 1982 by a handful of runners who decided to organize, the Windy City Striders grew into a nonprofit and an RRCA-certified club, and they now put on a slate that runs from this Halloween race through the Turkey Trot on Thanksgiving morning and a Resolution Run on December 26. They also help other Wyoming running groups with race-day logistics and volunteers, a habit that explains why a small-city club has stayed viable for so long. Run Wyld, which describes itself as three years into community event work and has donated to Project Kenny, the service-dog training program, and launched the 307 Bison Stampede obstacle race at Hogadon, brings the newer playbook: inflatables, glow runs, and a knack for making a 5K feel like a party.
What the two organizations have built together is a Halloween morning with four ways in. Serious half marathoners get a long, flat riverside route. Casual runners get a 5K past the golf course. Walkers and dogs get the same trail without a clock breathing down their necks. And kids get a kilometer of candy. The whole thing starts at a 100-year-old pump house that once moved water for the oil field and now moves people along the river — which is, more or less, the story of Casper's trails in miniature.