To calculate the circumference of a circle, you can use the formula:
\[ C = 2\pi r \]
where \(C\) is the circumference and \(r\) is the radius. For a circle with a radius of 2.5 feet and using \(3.14\) for \(\pi\), the calculation would be:
\[ C = 2 \times 3.14 \times 2.5 \] \[ C = 6.28 \times 2.5 \] \[ C = 15.7 \]
Thus, the approximate circumference of the circle, rounded to the tenths place, is:
\[ \boxed{15.7} \text{ feet} \]