Sunflowers typically bloom in late summer, usually around July and August, extending sometimes into the early fall. Annual sunflowers bloom during summer and into autumn, with some varieties blooming as early as July and others lasting until October. The blooming phase lasts about 20 days after the flower fully opens. It generally takes about 70 to 120 days from planting the seed for a sunflower to bloom, depending on the variety and growing conditions. Perennial sunflowers may bloom for 8-12 weeks during the same period. For planting, sunflowers should be sown after the last spring frost when soil temperatures are between 55 and 60 degrees Fahrenheit, typically in late spring. This timing supports flowering in mid to late summer. In summary, sunflowers bloom primarily in July and August and can extend their bloom time into September and October based on the type and growing environment.