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Back to Flagstaff Mountain

Lost Boulder

UT

Historical data for the Lost Boulder trail at Deer Valley.

Current Status

Groomed

Difficulty

Blue

Section

Flagstaff Mountain

Status Timeline

Current Season

11/14/20252/23/2026

Prior Seasons

11/29/20244/6/2025
12/14/20234/28/2024
Snowfall(215 days)
Closed(7)
Groomed(5)

Recent Changes

Feb 23, 2026, 01:00 AMLatest
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 Length81 days

Number of Days in Each State

Closed
103 days
Open
0 days
Hold
0 days
Groomed
68 days
Unknown
0 days