Answer: Strawberries are generally hardy in all parts of Colorado. In the ground, we recommend protecting strawberries over the winter, generally with a straw mulch applied about December 1. By then, cold weather has inhibited growth, and the soil is cold. Distribute the mulch over the plants to a depth of 1 to 2 inches. Hold it in place with weighted boards or piles of soil. This mulch prevents the plant from losing moisture to drying winter winds. It also prevents root damage caused by alternate freezing and thawing of the ground.
Leave the mulch on as long as possible to restrain plant growth in the spring. Early spring growth produces early flowers subject to damage by adverse weather. Therefore, check the plants under the mulch in March for new growth. When growth begins, part the mulch to allow sunlight to reach the foliage. As the plants continue to grow, gradually remove the mulch, leaving as much as possible as a soil mulch to keep the fruit off the ground. Rake the mulch back over the plants to protect them in case of a late spring frost. Remove soon after the frost danger is over.
Since yours are in containers where the roots and soil will be more exposed to cold winter weather, either sink the planter boxes in the ground during the winter months or insulate the bottoms and the sides of the planter boxes and leave them in place.
Best wishes with your strawberry plants!
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