Measurements at NOAA's Mauna Loa Observatory stopped following the recent eruption of the Mauna Loa volcano, when lava flow blocked staff access and took out power lines to the facility.

Under an emergency agreement, NOAA and the University of Hawaii have established a temporary measurement site at the nearby Mauna Kea volcano for the critical CO2 record and other atmospheric measurements taken at the observatory.

Media can contact: Theo Stein (303) 819-7409 ( or Karin Vergoth 303-632-6413‬ (

! Due to the COVID pandemic, the Mauna Loa observatory is closed to the public and not giving tours until further notice.

Tour Information for General Public

Tours of the Mauna Loa Observatory are performed by appointment only. To arrange for a tour please use the "General Visitors Link" below. Please note that the Mauna Loa Observatory is not an astronomical observatory and those interested in astronomy should visit

Visiting Scientists

If you are visiting to work at the site, please go to the "Visiting Scientists Link" below.

Directions to MLO sites

If you need directions to the observatory or the Hilo office from around the Big Island, please use the "Get Directions and Maps Link" below.

Preparation Checklist

Everyone should look at the Preparation Checklist before heading up to the observatory.

School Visits

MLO can host school groups and field trips on selected weekdays by creating interactive displays throughout the Hilo office. The displays are designed to inform, entertain, and involve the children. Many of the displays are flexible enough to be fitted to the education level of the incoming group. The following special reports are in Adobe Reader (.pdf) format, are suitable for printing, and are excellent resources for teachers interested in finding out what a visit to the MLO office entials. Please note that the Teacher section of our Education Center offers much more information on the activities we can provide, such as reports of each specific display. For more information on scheduling a school visit to MLO, see the General Visitors page.