How frustrating! This unfortunately does happen sometimes. When it does, remove the damaged spears as soon as possible. New spears should start growing in a few weeks. Do not harvest this year; let the ferns grow and then fade through the season. As long as the crowns were not damaged from the frost, the plant should recover. You can see how it responds this year—if the new growth looks healthy and vigorous, you should be fine for starting harvest next year. A thick layer of mulch can help protect asparagus if frosts are predicted.
How frustrating! This unfortunately does happen sometimes. When it does, remove the damaged spears as soon as possible. New spears should start growing in a few weeks. Do not harvest this year; let the ferns grow and then fade through the season. As long as the crowns were not damaged from the frost, the plant should recover. You can see how it responds this year—if the new growth looks healthy and vigorous, you should be fine for starting harvest next year. A thick layer of mulch can help protect asparagus if frosts are predicted.