Las Vegas sits in the Mojave Desert, and the Rock 'n' Roll Las Vegas Half Marathon starts on a late-February evening, after the punishing summer heat has long since broken and before spring's warm-up really gets going. This listing doesn't yet have a race climate-normals record in RaceRove's database, so there's no verified average temperature or historical race-day condition to report here — what follows is a general, qualitative picture of what a desert evening in this part of the calendar is typically like, worth pairing with an actual forecast in the days before you travel.

A Desert Climate, Even in Late Winter

Southern Nevada's climate is defined by low humidity and big swings between daytime and nighttime temperatures, and that pattern holds even in the cooler months. Afternoons in late February can feel genuinely mild and sun-warmed, while the same evening, once the sun drops, typically turns noticeably cooler — a shift that catches visitors from more humid climates off guard, since dry desert air loses heat fast once direct sun is gone. That daily swing is a defining feature of high-desert climates generally, not something unique to Las Vegas, but it's worth knowing before you pack for a single 'Las Vegas weather' expectation that doesn't really exist this time of year.

What a Late-February Evening Actually Feels Like

Generally speaking, late winter in Las Vegas sits well below the city's brutal summer highs — cool by desert standards, comfortable by most other standards, and dry enough that a jacket does most of the work regardless of the exact number on the thermometer. By the time a 4:30-ish start gets underway and the race stretches into full darkness, expect the kind of crisp, dry evening cool that desert regions are known for: not painfully cold for most runners, but a real and noticeable drop from where the afternoon sat. Because there's no verified climate-normals data on file for this listing, don't treat any specific number you see elsewhere as guaranteed — check an actual forecast close to race week instead.

How This Differs From a Typical Race-Morning Forecast

Most half marathon weather guides are built around a sunrise start, where the only real question is how hot it'll get by the time you finish. A late-February evening race in the desert flips that question around: instead of watching the temperature climb through your race, you're watching it fall, from whatever the afternoon topped out at down toward the evening low. That means the coolest part of your day, weather-wise, is likely to land right around your finish rather than your start — worth knowing so you don't overdress standing around at the gun and end up overheating in the first few miles, only to find yourself underdressed once you've actually stopped moving at a finish festival after dark.

Dressing for the Swing

The practical challenge of a desert evening race isn't extreme cold — it's the swing. You'll likely be comfortable, even warm, standing around the start village in the late-afternoon sun, and meaningfully cooler by the time you're approaching the finish after dark. Layering solves this better than any single outfit choice: a throwaway long-sleeve or light jacket over your race kit handles the start-line wait and the first mile or two, and can be shed once you've warmed up, without leaving you underdressed for the walk back to your hotel once you've stopped moving and the sun is long gone.

The Wildcards Worth Watching

Desert winter weather isn't perfectly predictable. Cold fronts can push through and drop temperatures well below what's typical for the date, and dry desert wind can make a mild evening feel considerably sharper than the air temperature alone would suggest. None of that is common enough to plan your whole race around, but it's common enough to check the forecast in the final days before you travel rather than relying on general seasonal expectations. February in the Mojave can swing from spring-like warmth to a sharp cold snap within the same week, so the safest approach is packing options rather than committing to a single forecast weeks out.