Cold, snowy days intermix with warm sunny days. Heavy pollen in the air from blooming junipers can mean watery eyes and runny noses for many people. The Main Loop Trail is the only trail where snow is removed. Snow and ice remains on most other trails and turns to muddy muck by mid-afternoon. The ladders at Alcove House may remain closed due to safety concerns if it has been a snowy winter. The Cross-country ski trails still have plenty of snow but on warm afternoons can become slushy. Abert's Squirrels remain active and may be seen feeding on the newly-running sap of Boxelder trees. By late month, the Sandhill Cranes can be heard as they pass overhead migrating back north. Visitation is slow but may begin to pick up by President's weekend. On occasion the parking lots have filled over this holiday. Collection of the entrance fee is done at the visitor center instead of the entrance station. Interpretive programs are only offered occasionally.