Would it be a good idea to use spf sunscreen to prevent freckles?

Freckles are benign: Sunscreen (applied 30-60 minutes before sun exposure) and broad-brimmed hat should help prevent facial freckles. Sunscreen on exposed areas should help, too; long sleeves and pants will help protect much of body. Use of sunscreen is good idea just to prevent sun damage, premature skin aging, skin cancers.

Sunscreen: Yes, but more importantly to reduce your risk of skin cancer.

Freckles : While some lesions are genetically programmed, routine sunscreen use may help to reduce the number of freckle/age spots.