Grande Ronde Valley, sunset rainbow August 6, 2020 Posted in Eastern Oregon, Union County Oregon Rarely does one see a sunset rainbow–the timing of late evening sun, clouds, rain, and color all have to come together for a very brief time. Last night, it all happened! Grande Ronde Valley, sunset rainbow Grande Ronde Valley, sunset rainbow Grande Ronde Valley, sunset rainbow Grande Ronde Valley, sunset rainbow Grande Ronde Valley, sunset rainbow Grande Ronde Valley, sunset rainbow