Field-based tests of aerobic fitness that can be administered quickly and do not require maximal effort are desirable. The purpose was to develop and validate quarter-mile walk tests for 10--13-year-olds. Participants (N = 59) walked one mile on two different days. Walk times, heart rates, body mass, physical activity, and aerobic fitness were assessed. Multiple regression was used to develop models to estimate VO[subscript 2max]. Quarter-mile walk models provided estimates of aerobic fitness that were similar in accuracy to previously published walk tests. The recommended model that balances accuracy and ease of administration was: VO[subscript 2max] = 119.691-(13.744*quarter-mile walk time [min])-(0.168*heart rate), R=0.73, SEE = 6.84 mL·kg[superscript -1]·min[superscript -1]. Walk times, heart rates, and estimated VO[superscript 2max] values were highly reliable. The walk tests developed provide valid estimates of VO[superscript 2max], are easy to administer, and could be particularly useful for unmotivated or overweight children when this equation is confirmed with a larger sample in group testing conditions.