The Steamboat Mountain trail runs along the northern edge of Springdale, just outside Zion National Park. It's a short and quick ride. The expected riding season would be mid-February through December.
I'm telling you about this trail because riders are constantly asking on-line about bike rides they can do while staying in Zion. This trail is as close to Zion as it gets. You can quickly ride your bike from the campground within Zion to this trail.
On Winderland Drive, watch for a gravel ramp on the left (uphill) side of the street. It goes up to the singletrack. The trail skirts the edge of homes for a bit, then arcs around a basin above the cemetery.
The loop is 1/2 mile around. At mile 1.9, you'll be back on the main trail with 1.4 miles to go for the return trip.
In La Verkin, turn east on Highway 9 and drive to Springdale. In Springdale, the highway will turn from northeast to east. Immediately look for Winderland Drive and turn left. After 0.15 miles, turn left on Paradise Road. In 0.15 more miles, find the gravel parking area on the left, across from the cemetery parking strip. You can do the eastern side out-and-back from here, or you can take city streets over to upper Winderland Drive to catch the trail on your left just above the last row of homes (in 2021).
No water or bathroom at trailhead.
GPS track file (right-click and "Save as..."): Download
Lodging, camping, shops: Links to St. George area resources