Technology is described for monitoring computing instance launch times. A launch plan for launching a computing instance in a computing service environment may be identified. A predicted launch time for launching the computing instance on a selected physical host in the computing service environment may be determined using a launch time prediction model. An actual launch time for launching the computing instance in the computing service environment may be identified. The predicted launch time that is determined using the launch time prediction model may be compared with the actual launch time for launching the computing instance in the computing service environment. The actual launch time may be determined as not being within a defined threshold of the predicted launch time. An alert may be generated to indicate that the actual launch time is not within the defined threshold of the predicted launch time.