Heat stress is actually harder on young calves than cold stress. Newborn calves have an immature “thermostat,” writes Mark Z. Johnson. He shares best practices for fall calving taking place during high temperatures.
The thermoneutral zone for a young calf is between 50 – 77 degrees Fahrenheit.”
Source: Drovers, August 21, 2023. Link. Shade and fresh water is critical. In addition to milk, calves need more fresh, cool water in hot weather to prevent dehydration, keep their rumen functioning correctly and maintaining health and appetite. Johnson says to make make sure water tanks sit low enough and water levels inside are high enough for baby calves to have access.