Frequently asked

• When is the trail running season in the Rocky Mountains?

  Mid-June through late September is the core window. Snow lingers on high passes into July most years, and afternoon thunderstorms get aggressive from mid-July through mid-August. The shoulder weeks of late June and mid-September are popular for that reason — fewer storms, drier trails.
• How much does altitude affect race performance?

  A lot more than most flatland runners expect. Above 8,000 feet plan for a 10–20% drop in sustainable pace; above 12,000 feet it can be 25–35%. Arrive at altitude either the day before (race on travel-fresh legs) or 7+ days early (start acclimatizing). Three to four days out is physiologically the worst window — you'll feel the altitude without having adapted to it.
• How dangerous are afternoon thunderstorms?

  Serious. Above tree line, lightning is the real threat — multiple fatalities most years across the range. Most well-run races have cutoffs designed to get runners off exposed ridges by 1pm. If you're slower than the cutoff, take the early start option. Carry a lightweight rain shell even in clear weather.
• Which Rocky Mountain races are good qualifiers for Western States or UTMB?

  Run Rabbit Run 100 (CO), Bighorn 100 (WY), the Bear 100 (UT/ID), and Wasatch 100 (UT) all carry Western States lottery tickets. Hardrock has its own qualifier system. For UTMB Index, Run Rabbit Run and Tushars Mountain Runs (UT) both rank well.
• What gear is non-negotiable for Rocky Mountain races?

  A waterproof shell (not just water-resistant), gloves, hat, and a headlamp for any race that could extend past sunset. Most race directors mandate at least the shell and headlamp. Add an emergency blanket and electrolyte tablets even if not required — high-altitude weather flips fast and aid stations are often farther apart than in lower-altitude events.