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Mars Hill via Lowell Observatory Loop, AZ

Guide 12 Triplogs  1 Active Topic
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no permit
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Difficulty 2.5 of 5
Route Finding 3 of 5
Distance Round Trip 7.48 miles
Trailhead Elevation 7,218 feet
Elevation Gain 426 feet
Accumulated Gain 426 feet
Kokopelli Seeds 9.61
Interest Historic
Backpack No
varies or not certain dogs are allowed
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7  2020-04-04 squatpuke
6  2017-10-07 TJHIKER
5  2017-09-02 NatureNerd6
8  2014-10-14 Crzy4AZ
56  2013-05-10
Northern Arizona Trek - May 2013
5  2009-07-20 Randal_Schulhaus
4  2007-02-18 Randal_Schulhaus
30  2006-09-16 Randal_Schulhaus
Author Randal_Schulhauser
author avatar Guides 71
Routes 98
Photos 9,967
Trips 1,009 map ( 9,248 miles )
Age 61 Male Gender
Location Ahwatukee, AZ
Historical Weather
Trailhead Forecast
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Preferred   May, Oct, Sep, Jun → 8 AM
Seasons   Spring to Autumn
Sun  5:12am - 7:44pm
Official Route
0 Alternative

Hiking Mars to Pluto
by Randal_Schulhauser

Likely In-Season!
Some History
In 1894 a wealthy Bostonian named Percival Lowell became passionately interested in Mars and the possibility of intelligent life on that planet. Under astronomy experts' advice, he became convinced of the advantages of locating a large telescope in dry conditions at high altitude. With such conditions prevalent in Arizona Territory, he dispatched a team headed by Dr. Andrew E. Douglass to find the ideal location for his dream observatory. Dr. Douglass visited Tombstone, Tucson, Tempe, and Prescott before sending a telegraph back to Lowell in Boston indicating; "I have found our location in Flagstaff Arizona." Construction soon began at the Mars Hill site for an observatory to house a 24 inch Alvan Clark Telescope. When the telescope was commissioned into service in 1896, it was the world's 4th largest telescope!

By viewing its surface through the 24-inch Clark Telescope, Lowell produced intricate drawings of the Red Planet, delineating hundreds of straight lines (termed "canals") and their intersections (which Lowell called "oases"). Lowell concluded that the bright areas were deserts and the dark were patches of vegetation. He further believed that water from the melting polar cap flowed down the canals toward the equatorial region to revive the vegetation. Lowell thought the canals were constructed by intelligent beings who once flourished on Mars. He published his views in three books: Mars (1895), Mars and Its Canals (1906), and Mars As the Abode of Life (1908).

Perhaps Lowell's most significant contribution to planetary studies came during the last years of his life when he devoted much of his time and energy to his quest for "Planet X," a hypothetical ninth planet. The search continued after his death in 1916 and led to Pluto's discovery by Clyde Tombaugh in 1930 using a specially designed photographic telescope. In Greek mythology, Pluto is the god of the underworld -- a perfect name considering planet Pluto dwells at the outermost reaches of the solar system. PL, the first two initials of the name Pluto, not so coincidentally is also Percival Lowell's initials.

The observatory is a registered National Historic Landmark and State of Arizona Treasure. Check out for more information.

The Hike
A quick side trip to the southern reaches of the Lowell Observatory parking lot along Mars Hill Road will provide a vista view of Flagstaff and the San Francisco Peaks. We choose to start our hike from the trail head located in the northwest corner of the Lowell Observatory parking lot. This trailhead is a short connector to Coconino National Forest Road #515.

Now begins the first of many hiking choices on Mars Hill. The numerous crisscrossing trails can form a confusing labyrinth so take careful note of any landmarks. We take the northwestern route along FR515 towards a feature denoted on my GPS as "Observatory Mesa" we estimate to be about 2.5 miles away. Towering Ponderosa Pines dominate your view along FR515. The thinned forest also provides a home to numerous birds and a variety of wildflowers.

After traveling about 1 1/4 miles along FR515, we come to a road barrier that demarcates the transition from Lowell Observatory Scientific Preserve into the Coconino National Forest. The barrier forms a T-intersection with an intersecting Forest Road and another hiking choice. We take the northern fork that soon joins a 4-way intersection between a vehicle access Forest Road and a Flagstaff Urban Trail System (FUTS) pathway. We are now about 1 1/2 miles from the parking lot Trail Head and decide the large quarry stone barrier provides a comfortable place to sit and rest.

We soon push on along the vehicle access Forest Road heading in a generally northwestern direction. The road passes a water-filled tank where we note many animal footprints. Elk, we surmise they are the source of the footprints. Near mile 2 1/2, we veer off the Forest Road towards my GPS POI (point-of-interest) noted as "Observatory Mesa." This turns out to be an unspectacular POI, only noted for the maximum elevation of Observatory Mesa.

Decision time again, A1 Mountain is another 2 miles west along the Forest Road, or do we explore the FUTS trail marking the original road constructed by the City of Flagstaff to access Lowell Observatory on Mars Hill? We choose to explore the historical road and retrace our steps about 1 mile back towards the east.

At the 4-way intersection the FUTS pathway re-enters the Lowell Scientific Preserve and continues to track due east. The FUTS pathway provides intermittent views of Humphries Peak. The pathway has an abundance of fungi and wildflowers along both sides (check out the photographic evidence). About one mile from the 4-way intersection, the pathway will begin a steep descent down Mars Hill. At the base of the hill are Thorpe Park and an alternate trailhead for accessing Observatory Mesa. There is vehicle parking by the baseball diamonds.

We loop back along the FUTS pathway towards Lowell Observatory. My GPS indicated 6 1/2 miles traveled when we reached the parking lot. There's still a guided tour of Lowell Observatory waiting that will ultimately add another mile to our trek.

The Lowell Observatory on Mars Hill occupies only a small portion in the southeast corner of Observatory Mesa. This mesa has an extensive network of hiking and biking trails made famous by mountain biking publishing icon "Cosmic Ray". The Flagstaff Urban Trail System (FUTS) also provides access to the mesa. I have described one possible hike. Take advantage of the many trails and Forest Roads to create your own custom hike. At the same time, take in a guided tour of Lowell Observatory for history and science. This is an excellent combination for kids. Enjoy!

Check out the Official Route and Triplogs.

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2006-09-20 Randal_Schulhauser
    WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.

    Permit $$

    Map Drive
    Paved - Car Okay

    To hike
    From Phoenix: Take Hwy I-17 north 140 miles to Flagstaff. At the junction with Hwy I-40, continue north through Flagstaff on Hwy 89 (aka Milton Rd) about 2 miles. Hwy 89 will become Historic Route 66 and bend underneath the BNSF railway line. Turn left immediately after the underpass and travel west along Santa Fe Ave. In about half a mile, Santa Fe Ave will become Mars Hill Road. Continue up Mars Hill to the Lowell Observatory parking lot located on Observatory Mesa.

    My GPS noted 160 miles traveled from my home in Ahwatukee to the trailhead near the Lowell Observatory parking lot. Travel time was just under 3 hours, including a couple of stops for gas and refreshments. GPS coordinates for trailhead are 35o 11.961'N, 111o 39.733'W.
    90+° 8am - 6pm kills
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