Usually spring quarter/semester admits are reserved for special cases like academic re-entry, medical disabled, and military duty students. Historically freshmen (straight from HS) applicants can only apply in the fall while transfer applicants can apply to one UC campus (Merced) for spring entry.
Do you have the minimum 30 California Community College credits (60 overall) needed to apply as a transfer? If yes, then you can try to apply as a spring transfer to UC Merced (if they open admissions for spring transfers). If not, then no you would have to wait until next fall.
Also, there is no guarantee Merced will even open their spring application period. Currently all UC campuses are open to applicants during fall only:
Source: http://admission.universityofcalifornia.edu/how-to-apply/check-majors/index.html