Dear Gail,

Thank you for contacting Ask Extension about over-wintering your Boston fern. Here is a good article about bringing in your fern. You may let it grow through the winter, or let it go dormant in a cool, dark place. (Please note that Extension does not promote or recommend businesses or brands.)
https://plantaddicts.com/fern-winter-care/

Additional information can be found here:
https://extension.umn.edu/houseplants/tropical-ferns

The Boston fern (Nephrolepis exaltata) likes consistently moist potting soil and high humidity. Even so, your fern may develop brown tips when exposed to dry indoor heat. 
One solution is to place plants in brightly lit locations in the home that usually have higher humidity levels, such as bathrooms and kitchens. Another option is to place plants on trays/saucers containing water and pebbles. (Make sure the water level does not reach the bottoms of the pots.) Water evaporating from the trays/saucers will increase the humidity levels in the vicinity of the plants. 

Water your fern only when the soil surface is barely moist.
You can also use a plant mister or a plastic spray bottle that gives off a fine mist. Mist the plants early in the morning and apply enough to moisten the fronds. Do not over-mist so the plant is dripping.

I hope this information is helpful. Please write again if you have additional questions.