Rialto is a city in San Bernardino County, California, United States. According to Census Bureau estimates, the city had a population of 99,171 in 2010.
Rialto is home to four major regional distribution centers: Staples, Inc., which serves stores across the entire West Coast of the United States, Toys "R" Us, FedEx and Target in the northern region of the city, in the Las Colinas community. One of the United States' largest fireworks companies, Pyro Spectaculars, is also headquartered in Rialto.
Rialto features a somewhat cooler version of a Mediterranean climate which may be characterized as a Continental Mediterranean climate, which is known for wet, cool to chilly winters (frost is common during this time of the year) with hot, dry summers. Relative to other areas in Southern California, winters are colder with frost and with chilly morning temperatures common.