The Lainy's Light 5K Santa Run/Walk

The Lainy's Light 5K Santa Run/Walk is held in Tucson, Arizona, on December 5, 2026, with one format on the schedule: a 5K (3.1 miles) that starts at 9:00 AM and welcomes runners and walkers alike. A 9:00 AM start in southern Arizona in December means cool, dry air and none of the heat that shapes racing there for much of the year.

The distance is short enough to enter on a whim and long enough to be worth preparing for. Newer runners can get ready with four to six weeks of easy running three times a week, mixing in short walk breaks as needed. If you already run regularly and want a fast 3.1 miles, add one weekly workout of hard repeats, something like six times three minutes with equal recovery, and keep everything else conversational. Tucson mornings can be genuinely cold before the sun clears the mountains, so plan a throwaway layer for the start corral.