I would say grey fox, based on the black-edged tail. Many greys will have lots of red on them, but they are still noticeably "gray". Also the chest area looks lighter, also indicating grey to me.
Check my photo back a page or two of a gray fox. I know it was a gray since I've also seen it around in the daytime plus on some photo, someplace, I do have a red for comparison purposes--just can't locate it amongst the 500 or so game cam photos.