In trials in eastern Arizona 'Frontier' and another American hybrid, 'Regal', were found to have the highest tolerance of the hot and arid climate, notably exhibiting minimal leaf scorch. However, 'Frontier' is known to have sustained winter damage where planted in the Great Plains [https://web.archive.org/web/20060907044900/http://www.oznet.k-state.edu/path-ext/factSheets/Trees/Dutch%20Elm%20Disease.asp. This failing was repeated in the elm trials conducted by the University of Minnesota, although the tree often recovered the following year. It was also criticized for its form and integrity, considered "unsuitable" for urban forestry.