Question. Context: In addition to movements related to available shelter and food, the breeding cycle is important in understanding deer behavior. The "rut" or mating season usually begins in the fall as does go into estrus for a period of a few days and males become more aggressive, competing for mates. Does may mate with more than one buck and go back into estrus within a month if they did not become pregnant. The gestation period is about 190 -- 200 days, with fawns born in the spring, staying with their mothers during the summer and being weaned in the fall after about 60 -- 75 days. Mule deer females usually give birth to two fawns, although if it is their first time having a fawn, they often have just one.

Question: when do mule deer give birth in colorado?
Answer. the spring
What step-by-step reasoning justifies that answer?
Reasoning: The relevant information to answer the above question is: The gestation period is about 190 -- 200 days, with fawns born in the spring, staying with their mothers during the summer and being weaned in the fall after about 60 -- 75 days.