Data are presented on the growth and reproduction of the tundra hare (Lepus othus Merriam) from the Clarence Rhode National Wildlife Refuge, western Alaska. The estimated average growth rate for juvenile hares is 37.2 grams per day over a 102 day growth period from a birth weight of 100 grams to a minimum adult weight of 3900 grams. The single annual litter averages 6.3 (N = 10). A conception period from 13 to 29 April and a parturition period from 29 May to 4 June are deduced from estimated embryo ages.