Before the first “hard” frost (~25°F)

• Dig up tender bulbs such as dahlias and non-winter-hardy plants for winter storage.
• Bring inside all frost/freeze-tender potted plants, after treating for insect problems.
• Pull-up, shake out and bring to the compost pile all vegetable and herb debris killed by frost and weeds.
• Plant spring flowering bulbs.
• Clean up and level garden beds and mix-in compost for next year.
• Cut back spent perennials. Leave grasses untouched for winter interest and cut back in early spring or, if preferred, cut back now to approximately 6 inches.
• Remove, clean and store away re-usable plant supports and containers.
• Gather and discard leftover labels, plant tie-ups and non-biodegradables.
• Clean tools to prevent rusting over the winter and prolong their useful life.
• Jot down observations from this year to help recall later what you have learned this season to make next year more successful.
• Drain and coil hoses before they freeze. Store in garage, shed or basement.
• Drain exterior faucets.
• Rake leaves off lawns before they mat-down and damage the grass. Shredded leaves can go in the compost pile or can be used as mulch around trees and shrubs.

Now, until the ground freezes: 

• Plant or transplant trees and shrubs (and maintain soil moisture!).
• Divide and transplant most perennials, like peonies and daylilies.
• Plant garlic and shallots for next year.
• Assure soil around plants newly installed this year is adequately moist.