Please Excuse the Dust. Our website is currently under construction.

                            is the on-line home of Tri-State Materials, located near Diamond Valley Lake, in Winchester California.

                               Tri-State Materials offers a large selection of products ranging from decomposed granites, cobbles, and boulders, to flagstones

                               and other exotic specimens.

                                      Be sure to check the Frequently Asked Questions (FAQ) page for any questions you might have, or feel free to contact us with

                               any questions not answered or clearly detailed on the site.

                        Hours of Operation: Summer 2015


                               Mon - Fri 700am - 430pm

                               Saturday 730am - 330pm


                               Mon - Fri 630am - 400pm