Night sky viewing can be excellent, however, a mist can often set in in the early morning hours clouding the areas of the sky closest to the horizon, but leaving the area directly overhead clear.
Light pollution from Corpus Christi can interfere somewhat with night sky observations in the northern end of the park, but only with constellations or objects in the lower regions of the northern and north-northwestern portions of the sky. At five miles below the Malaquite visitor center there is minimal interference and this decreases as one travels south.