Glen Helen Regional Park is the site of California Historical Landmark NO.

In 1850, David W. Cheesman, a lawyer heading west to California with his family from Indiana on the Mormon Road, described what became Sycamore Grove: For several months in 1851 the grove was the camp for the Mormon colonists who were negotiating the purchase of the Rancho San Bernardino, that became the site of their colony, later the city, of San Bernardino.

Between June and September 1851, Sycamore Grove was the first camp of the parties of Mormon colonists, who founded the city of San Bernardino.

They included groups led by Captain Jefferson Hunt, Amasa Lyman, Charles C. Rich, David Seely, and Andrew Lytle.

[4] Sycamore Grove California Historical Mark at the site reads: Glen Helen has hosted off-road races since 1985.