View data as of
Back to Flagstaff Mountain

Lost Boulder

UT

Historical data for the Lost Boulder trail at Deer Valley.

Current Status

Closed

Difficulty

Blue

Section

Flagstaff Mountain

Status Timeline

Current Season

11/14/20253/29/2026

Prior Seasons

11/29/20244/5/2025
12/14/20234/27/2024
Snowfall(230 days)
Closed(8)
Groomed(5)
Unknown(1)

Recent Changes

Mar 29, 2026, 06:31 PMLatest
Groomed→Closed
Feb 23, 2026, 01:00 AM
Closed→Groomed
Feb 10, 2026, 07:30 AM
Groomed→Closed
Dec 28, 2025, 10:30 AM
Closed→Groomed
Sep 29, 2025, 02:30 AM
Closed

Statistics

Trail Season Length91 days

Number of Days in Each State

Closed
245 days
Open
0 days
Hold
0 days
Groomed
79 days
Unknown
0 days