Reindeer Run 5k, 10k, 15k, Half Marathon

Reindeer Run 5k, 10k, 15k, Half Marathon offers four distances in Riverside, California, on December 20, 2026: a half marathon (13.1 miles), a 15K (9.3 miles), a 10K (6.2 miles) and a 5K (3.1 miles). The event is set up for a relaxed run or walk rather than a hard-edged race, and strollers are welcome, though dogs are not allowed. Everyone who finishes receives a medal and a goodie bag, and official results with times are posted after the event.

Having the half marathon alongside three shorter options makes this a flexible target: enter the 13.1 if you have been building all autumn, or drop to the 15K or 10K if the training has not gone your way. For the half, you want a weekly long run of 10 to 12 miles in the six weeks beforehand, and a couple of easy days before race morning.