Hurricane Idalia had a width spanning about 190 to nearly 350 miles across. Specifically, the field of tropical storm-force winds was roughly 190 to 218 miles wide, while the entire storm's size at landfall was nearly 350 miles across, which is approximately the size of the state of Colorado (which measures about 380 miles).

The diameter of the hurricane-force wind field was about 37.4 miles. This indicates that while the strongest winds were concentrated in a smaller core, the storm's overall impact area was much broader.