Frontier Elm (Ulmus 'Frontier') is a medium-sized shade tree known for its broad, rounded habit and attractive foliage. It typically grows to a height of 50 to 60 feet and a spread of 40 to 50 feet at maturity. The tree has a strong central leader and wide-spreading branches that form a broad, open canopy. The leaves are medium green and turn yellow in the fall, providing attractive autumn color. Frontier Elm is a disease-resistant cultivar that is tolerant of Dutch Elm disease, making it a good choice for planting in areas where the disease is a concern. It is also adaptable to a wide range of growing conditions, including urban environments. Keep in mind that the growth rate and size may vary depending on the specific growing conditions and location.