There were 25-30,000 Chinese who came to California to work on the Transcontinental Railroad between 1865 and 1870. They accounted for about 5% of the population.

In the 1850's Seth Lewelling, who went from Calif. to Oregon (his brother was one of the early Calif. immigrants included here) developed a new variety of cherry which he named "Bing" after a Chinese foreman at one of his vineyards in Oregon.

Links:

COOLIES, SAILORS AND SETTLERS, Voyage to the New World
at PBS Ancestors in the Americas.
The Chinese American Experience 1857-1892 at HarpWeeek
THE CHINESE RAILROAD MEN at the CPRR Museum Page
    In the famous Last/Golden spike picture
    2 of the 3 railroad workers where Chinese.
    
Chronology of Asian American History
Long family Winters fruit ranch started in 1860