- Recommended by Utah State University because of its cold tolerance.
Non-GMO Oakleaf lettuce is ready 55-65 days. Utah State University recommends this lettuce strain. The Oakleaf can tolerate colder temperatures. The leaves of the Oakleaf have a mildly sweet flavor, and this leaf lettuce gets its name from its oak leaf resemebelance. Oakleaf lettuce thrives in warm and cool climates.