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So, first of all, this is the second time I've seen strange lights in these mountains. Both times I was with four other people, two of which were with me both times.
So, on saturday I went backpacking in the mountains, about 30 miles from the city and 10 miles from the nearest farms/homes. It was about 11pm-12am (I don't usually keep track of time when outdoors). One of my friends spotted an unusually bright, yellowish light that appeared from behind a mountain west of our campsite (the nearest farms and homes are almost 10 miles east of our campsite). The light then started moving south at a constant speed slightly faster than that of a plane (across our field of vision at least; it's hard to say how far away it was), but it was moving erratically up and down while it moved south. The light dimmed slightly, then went dark for a couple of seconds, then started flashing slowly (blinking about once per second), changing colors between green and red seemingly randomly. Then it disappeared behind a hill southwest of where we first saw it.
Edit: For a moment I thought it was a drone, but it was absolutely silent, and there's never any people in those mountains. The closest communities in that direction are very tiny, rural settlements about 40 miles east of our location, and there's no way those people have a drone. They don't even have electricity. Besides, the vertical movement was not consistent with a drone.