A new and unique x Mangave plant named ‘;Desert Dawn’; characterized by a rounded mound of fleshy, fleshy, linear to lanceolate leaves that develop dense reddish to greyed reddish-purple spotting with intense light and is proximally outwardly with slightly upwardly toward apex. The leaves have numerous small, firm marginal teeth pointing outwardly to slightly recurving toward base. The upper foliage develops a distinct purplish center stripe. The new plant is suitable for the garden or as a potted plant in the garden or home.