What temperature does sunflowers need?

Sunflowers thrive best in temperatures ranging from 70°F to 85°F (21°C to 29°C). They are sensitive to frost, so it's important to plant them after the last frost date when the soil temperature is consistently above 50°F (10°C). Sunflowers can tolerate higher temperatures, but extreme heat above 95°F (35°C) may stress the plants and affect their growth. Proper sunlight exposure is also crucial for their development.