Phone: Ext. 6453


Degrees and Certifications:

Secondary Education Mathematics B.S.

Ms. Tessa Costich

Hello all! My name is Ms. Costich and this is my 3rd year teaching and my 2nd year at Coco. Before teaching at Coco, I taught middle school in Williams. I student taught here at Coco and fell in love with it, always hoping to return. At Williams I taught 6th, 7th, and 8th grade math. Here at Coco, I teach Geometry and Honors Geometry. Outside of school, I enjoy hiking, camping, and backpacking throughout Flagstaff and areas around Flagstaff. I also love to snowboard! During snowboarding season you can catch me at Snowbowl almost any weekend. I also have a dog named Winston who was born completely deaf!

This year my schedule is:

1st Period - Geometry

2nd Period - Geometry

3rd Period - Prep

4th Period - Geometry

5th Period - Geometry

6th Period - Honors Geometry


Make sure to check our Canvas page to find out more information about our course! In Canvas, you can find our class syllabus which includes the grading policy, late work policy, make-up policy ,homework policy, and classroom expectations.

If you have any questions you can always feel free to email me at, send me a message through Canvas, or send me a message through StudentVue/ParentVue.