Seasons/months best for roses

"When are they best to plant?"

Roses are best to plant during spring or fall after its frosty

"When do roses thrive the most?"

Roses thrive the most during late may through early fall

"What months do roses bloom in?"

May through october is when they bloom the most

"How long should you wait before first frost?"

At least six weeks before the first frost.

"Should you avoid frost?"

Yes,you should

"When do you recommend planting them?"

After frost so you can have more time.