Administrators can observe teachers for evaluative purposes at any time after the Initial Planning Conference and then through the first Friday in June. In addition, half the required minimum number of observations must take place in the fall term and half in the spring. You should not be observed during the spring window until you receive the final required evaluator form for all required observations during the fall window.
Here are the specific timelines:
Fall Window: From the Initial Planning Conference to the last day of the fall term
Spring Window: From the start of the spring term to the first Friday in June