Calflora, a 501c3 non-profit
Distribution by County   1218    
Bromus tectorum  L.
Cheatgrass, downy brome, Downy brome grass, Downy chess
Bromus tectorum is an annual grasslike herb that is not native to California.
Cal-IPC rating: high
Record Count by County

Alameda: 16 Kern: 708 Nevada: 188 Shasta: 306
Alpine: 84 Kings: 5 Orange: 28 Sierra: 114
Amador: 4 Lake: 31 Placer: 139 Siskiyou: 273
Butte: 50 Lassen: 1106 Plumas: 358 Solano: 4
Calaveras: 17 Los Angeles: 444 Riverside: 863 Sonoma: 63
Colusa: 11 Madera: 139 Sacramento: 13 Stanislaus: 3
Contra Costa: 5 Marin: 606 San Benito: 41 Sutter: 5
Del Norte: 5 Mariposa: 1226 San Bernardino: 499 Tehama: 168
El Dorado: 205 Mendocino: 22 San Diego: 315 Trinity: 112
Fresno: 348 Merced: 13 San Luis Obispo: 54 Tulare: 356
Glenn: 12 Modoc: 656 San Mateo: 19 Tuolumne: 350
Humboldt: 33 Mono: 574 Santa Barbara: 58 Ventura: 89
Imperial: 6 Monterey: 66 Santa Clara: 14 Yolo: 8
Inyo: 943 Napa: 50 Santa Cruz: 22 Yuba: 11

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2026. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 06/10/2026).