DIAMOND HEAD, OAHU (HawaiiNewsNow) - The Diamond Head State Monument trail will close weekdays for most of January for improvement work.
The weekday closure runs from Wednesday through Jan. 19.
The trail will be open weekends and on Martin Luther King Jr. Day (Jan. 15).
Diamond Head is one of Hawaii's most popular trails, attracting more than one million people annually.
The state says the closure is needed for work to the lower part of the hiking trail.
"The soft, crumbly rock that makes up Diamond Head, leaves this landmark susceptible to deterioration due to the natural effects of erosion, as well as the numbers of people utilizing the trail," said Curt Cottrell, state parks administrator.
"This trail stabilization work will ensure a safe hiking experience for park visitors."
The work comes in the wake of a $1.7 million rockfall stabilization project at the landmark.
During most of the trail improvement work, the "crater park" and its restroom and visitor center will remain open.