CSUs typically admit eligible (needed courses completed) transfer students by college GPA within buckets defined by:
- California residency.
- Local area residency.
- Major applied to.
“Impaction” refers to when a CSU campus or major has more applicants than it can admit at minimum standards (2.0 college GPA for residents, 2.4 college GPA for non-residents). If there is campus, then the college GPA threshold may be higher than the minimum standards; if there is major impaction, then the college GPA threshold may be higher than the minimum standard for those majors. Some campuses, like SJSU and CSUN, are more transparent about past admission thresholds than other campuses. For example, http://www.sjsu.edu/admissions/impaction/impactionresultstransfer/index.html shows the GPA thresholds SJSU used for those applying to transfer for fall 2019. https://www.csulb.edu/admissions/fall-2019-major-specific-requirements-transfer-students has some information for CSULB transfer admission for fall 2019 (note: veteran status may cause CSULB to favor you like local area applicants).
https://www2.calstate.edu/apply/transfer has some general CSU transfer admission information. https://www2.calstate.edu/attend/degrees-certificates-credentials/Pages/impacted-degrees.aspx can show you what campuses and majors are impacted.
For UC, admission is a holistic process involving review of your academic record and essays, but college GPA is heavily emphasized. https://www.universityofcalifornia.edu/infocenter/transfers-major can give you an idea of how selective each UC campus and major is for transfers.