When is the best time to plant your flower beds for next year?

your best time for spring bulbs is now (fall) they should be dug in a hole that is at least 2x as deep as the size of the bulb. They are perfectly fine over the winter

Bulbs need the winter to bloom in the spring, so plant them now before the first freeze.

Bulbs need to be planted before the fall frost cycle begin.

"If you want spring-blooming flowers like daffodils, tulips, and hyacinths, you need to think ahead and get the bulbs in the ground before the first hard frost. They need a long period of cold weather to initiate the biochemical process that causes them to bloom and time to develop roots. "

https://www.rodalesorganiclife.com/garden/8-gardening-mistakes-you-make-every-fall/slide/5

Just check with a gardening shop about the bulbs' hardiness as well as when to plant them. It depends on the species and variety, so it's best to check for each one. But don't worry, most will be winter hardy.

Spring bulbs are planted in the fall,fall bulbs are planted in the spring

Tips for Planting Your Favorite Bulbs - Better Homes and Gardens

www.bhg.com/gardening/flowers/bulbs/planting-tips/