This project aims to assess the effects of heat stress on grape production and on developing new strategies to mitigate heat stress effects in vineyards. We will elucidate whether varying irrigation levels influences the response to a heatwave in Okanagan Valley vineyards and study the capacity of bio-stimulants and an anti-transpirant to mitigate heat stress and heatwaves in vineyards. We will also assess how eight major grape cultivars grown in BC are susceptible to heat stress and which cultivars better recover from heat stress. Finally, we will conduct a regional-scale study of temperature effects on grape quality (sugars, acids, and aroma) in the Okanagan Valley, and model optimal environmental conditions for grape quality.