Three Ponds is the Snow Canyon walk that delivers something the other short trails don't: water, occasionally. The "ponds" are seasonal slickrock potholes — natural depressions in the Navajo sandstone — that fill with rainwater and snowmelt and hold it for a few weeks at a time. After a wet winter they are real pools deep enough to wade in. After a dry winter they are stained dimples in the rock with maybe an inch of sediment at the bottom.
When the ponds exist
The window is roughly February through April in a normal year, sometimes stretching into May after a heavy snowpack on Pine Valley Mountain. By June the desert evaporation rate has done its work and the ponds are usually empty. Locals who time it right hike Three Ponds in March on a sunny afternoon when the highest of the three pools is full and reflecting the sandstone wall above it. Three weeks later the same pool can be bone dry. The park's visitor center keeps a current note on conditions; calling ahead before driving out matters.
The walk
From the trailhead off the West Canyon Road, the route crosses sandy benches, climbs through a slickrock corridor, and arrives at the lowest of the three pools after about a mile. The middle and upper pools are progressively higher and require some scrambling on slickrock to reach. The terrain is straightforward but the sand makes it feel longer than the listed distance — most parties take 2.5 to 3 hours round-trip.
What lives in the pools
When the ponds hold water, they hold tadpole shrimp, fairy shrimp, and the occasional spadefoot toad larvae — desert-pool ephemerals whose entire life cycle plays out in the few weeks between when the pothole fills and when it dries. The park asks visitors not to swim in or wade through the upper pools when biota are visible, because the eggshells and cysts that make the next year's hatch are concentrated in the bottom sediment. The lowest pool is generally fine to dip a hand into.
Heat and shade
Like the other Snow Canyon walks, Three Ponds has very little shade. The slickrock corridor sections retain heat into the evening. The trail is a winter and early-spring hike — by the time the desert summer arrives, the ponds are gone anyway and the walk loses its reason for being.
Where it fits
Three Ponds is the Snow Canyon trail that rewards timing. The park's other short walks — Petrified Dunes, Whiterocks, Hidden Pinyon, Lava Flow — work in any season the heat allows. Three Ponds works for a six-week window after the winter rains and almost not at all the rest of the year. Most St. George locals know to check it once in March and skip it the rest of the time. It's also the only Snow Canyon walk that connects your short-trail rotation to actual moving (or pooled) desert water, which makes it worth the timing effort when the conditions cooperate.