Abstract Three cultivars of muskmelon ( Cucumis melo L. ‘Honey Dew’, ‘TAM-Dew’ and ‘TAM-Uvalde’) were seeded and grown under four different soil-temperature regimes. Internode length, leaf area and total shoot dry weight increased with the addition of supplemental soil heating in all cultivars. ‘TAM-Uvalde’ was more responsive to changes in soil temperatures than the other cultivars. Stem growth as measured by dry weight was favored over leaf growth in all cultivars subjected to warmer soil temperatures. Female flowering and fruit set of only one cultivar, ‘TAM-Uvalde’, were accelerated by elevating the soil temperature.