Facebook Tracking Pixel

This site provides information using PDF, visit this link to download the Adobe Acrobat Reader DC software.

Urgent News

Update Center

Coronavirus (COVID-19) information

Laura Hertzler

Head of School

Ms. Laura joined Keystone in 2011. Ms. Laura is responsible for the vision, management ...

November 19, 2020


Dear Keystone Parent/Guardian,

In keeping with Keystone Montessori’s response plan for COVID-19, this letter is to inform you that we have had two positive test results for COVID-19 from individuals who were last present on our campus on Friday, November 13th and Monday, November 16th.  Due to privacy requirements, we will not be releasing the names of the individuals or details that may identify him or her. We are keeping them in our thoughts and wish them a full and speedy recovery.

In accordance with local and state regulations, we have reported the cases to local health officials, and any individuals determined to have been in close contact with the infected individuals have been contacted. All areas on campus where the person is confirmed to have been, will be thoroughly cleaned and disinfected according to all recommended procedures. We will continue to keep you informed of any updates or changes to the situation.

We do not have reason to believe that those who were not in close contact with the infected individual have reason to be concerned, but we ask that you, as always, watch for symptoms of COVID-19. 

Any of the following symptoms indicate a possible COVID-19 infection:

Temperature of 100.4 degrees Fahrenheit or higher when taken by mouth;
Sore throat;
New uncontrolled cough that causes difficulty breathing (or, for students with a chronic allergic/asthmatic cough, a change in their cough from baseline);
Diarrhea, vomiting, or abdominal pain; or
New onset of severe headache, especially with a fever. 

If you or any member of your family does begin experiencing any of these symptoms, we encourage you to contact your physician. If you would like information on COVID-19 testing, please visit https://www.azdhs.gov/index.php. We also ask anyone in the Keystone community who has tested positive for COVID-19 to please notify us by contacting Sue Smith at 480-460-7312.

If you have any questions or concerns, please reach out to Keystone Administration.

Thank you for your continued support and your patience as we navigate through this together.


Keystone Montessori


November 17, 2020

Community Meeting Presentation


November 12, 2020

Dear Keystone Families,

We are writing today to share information on the benchmark status from the Arizona Department of Health Services (ADHS). As you know, Keystone’s mitigation plan is formulated with guidance from ADHS and each decision we make is for the health and safety of our students and staff.   

The Keystone Administration monitors the COVID-19 metrics daily. We have observed a rise in numbers that make up the benchmarks for the Safe Reopening of Schools. ADHS advises that when a county has one benchmark in the red category for two or more weeks, even if different benchmarks, schools should consult with their local health department to determine whether to prepare to transition back to virtual learning with onsite support services. The most recent metrics show the number of cases has been in the red two weeks in a row, most recently with 129 cases per 100,000. At the time of our return to In-Person learning on September 14th, ADHS reported 52 cases per 100,000. Since that time, the number of cases has more than doubled and is still increasing along with the percent positivity rate. We have put in a formal request for a conference call with the Maricopa County Health Department and are waiting for their reply.

You can view the dashboard and current benchmark numbers HERE. In an effort to provide as much notice as possible, we want to make you aware that we are considering, in the best interest of our students and staff, to return to Distance Learning for our Charter students if this trend continues. We will be discussing this information with the Board of Directors before any decision is made.

The Toddler and Children’s House programs will remain open following all current safety protocols unless otherwise directed by the Governor. These programs are considered child-care by the State of Arizona. Keystone opened these programs in July and was mandated by Executive Order to keep them open and operational. Keystone will continue to follow all directives from state and local officials in our goal to keep our students and staff safe and healthy.

If we move to Distance Learning for all Charter students, it is our hope that the numbers will quickly fall to a safe level and we will return to In-Person instruction as soon as possible. We will make every effort to communicate any changes in a timely manner. Thank you for your understanding and continued support. 

In Health and Peace,

Laura Hertzler          Stefan Linder
Head of School        Associate Head of School


October 19, 2020

Please review our updated Mitigation Plan


October 12, 2020

In the event you need to have a COVID test we wanted to share some helpful information. ADHS has partnered with Arizona State University to launch several testing sites providing free saliva diagnostic testing for COVID-19. The tests are by appointment only with no walk-ins accepted. Children under 5 years old cannot receive saliva tests. For more information, please click HERE.


September 22, 2020

Community Meeting Presentation


September 10, 2020

Dear Keystone Families,

Please find the presentation from our first In Person Instruction meeting HERE


September 5, 2020

Dear Parents of Elementary & Adolescent Students,

The Board of Directors met on Friday, September 4th to discuss the AZDHS benchmarks as of September 3rd. The Keystone Administration is pleased to announce that the benchmarks have been met for a return to in-person instruction in the hybrid model! We are grateful for your support as we began our school year in a Distance Learning format to ensure the safety of our students and staff. Please take the time to read this communication in its entirety, as it contains important information on the procedures and timeline for a return to campus. CONTINUE READING


August 29, 2020

Dear Keystone Families,

Thank you for your continued support as we work together for the Keystone community. On Wednesday, August 26th, the Keystone Board of Directors met to discuss the reopening for in-person learning at Keystone.

The Keystone Board of Directors and Administration remains committed to the well being of our students, staff and families. As previously discussed at the August 10th Board of Directors meeting and subsequently communicated to the community of August 12th, we will continue to follow and refer to the Arizona Department of Health Services (AZDHS) benchmarks for determining a date for a safe return to in-person instruction for our Elementary and Adolescent programs. A link to the benchmarks and current metrics, which are updated every Thursday, can be found HERE

The full document outlining safely returning to in-person instruction released by the AZDHS can be found HERE


August 12, 2020

Dear Keystone Families,

We hope this letter finds you healthy and settled into new routines for the start of our school year. Each member of the Keystone staff appreciates your unwavering and continued support, patience, and kindness. In an effort to keep you informed on discussions and decisions for Keystone, we would like to share the most recent updates concerning COVID-19 and the Keystone community. CONTINUE READING.


July 25, 2020

Dear Keystone Families, 

Please find our updated Safety Protocols HERE. Thank you for your continued support and we look forward to seeing you soon.


July 18, 2020

Dear Elementary and Adolescent Parents,

As we approach our first day of school, we would like to thank you for your messages of support. The staff and administration have worked throughout summer to ensure the best possible beginning to the year online. In order to properly prepare for the start of the year, please take note of the information below. CONTINUE READING  


July 15, 2020

Dear Toddler and Children’s House Families,

As we approach our first day back to campus for the 2020/2021 school year, we would like to thank you for your messages of support and your patience as we planned for the start of school. The Staff and Administration have worked all summer to ensure a safe return to campus for our students, and we are so eager to see the children! CONTINUE READING


July 3, 2020

Dear Elementary and Adolescent Parents,

Thank you for taking the time to review our safety protocols and completing the survey regarding our return to campus for the 2020-21 school year.  CONTINUE READING


June 25, 2020

Dear Keystone Families, 

All of us here at Keystone Montessori are looking forward to receiving the students back onto campus and have been busily working to welcome them for the 2020-21 school year! The guidelines that were put forth by the AZ Department of Education were extensive. The Keystone staff and administration spent countless hours looking at each recommendation, weighing it against our Montessori principles, and working together to design a plan that will address the safety of our community. CONTINUE READING


June 3, 2020

Dear Keystone Families, 

We are pleased to share an update regarding the reopening of Keystone Montessori School. Your support and understanding through the end of the school year has been a source of strength for each of us, and we are looking forward to welcoming the children back to campus. CONTINUE READING



May 16, 2020

Dear Keystone Families,

We are so grateful for your continued support throughout the end of this unusual school year. The Keystone community has been a constant source of inspiration for the staff with your messages, updates, and your participation in all of the Learning from Home activities! CONTINUE READING



April 3, 2020

On March 30th, Gov. Ducey and Supt. Hoffman jointly announced physical school closures through the end of the school year. While the Keystone Staff is saddened by this development, we support the need to ensure the safety of our students and families. Every member of the Keystone staff is working to support our students remotely and we will continue to do everything in our power to keep our community connected and learning. 



March 29, 2020

Dear Keystone Families,

The Keystone Board of Directors continues to be grateful for your support and understanding during this uncertain time. We would like to acknowledge the time and effort each member of the Keystone staff has poured into supporting the children as Learning from Home continues. We also acknowledge your efforts in integrating educational activities into your homes and schedules. CONTINUE READING



March 25, 2020

Dear Keystone Families, 

What a week! It has been both very busy and much too quiet on campus. The staff has been in and out as they prepare lessons for Learning from Home and my heart is full seeing them even if it is for just a short time each day. We are diligently keeping our social distance while we work! The highlight of the week was overhearing some of the first Zoom meetings. The sound of the children talking, laughing, and sharing brought some joy to campus.  Thank you for your continued support this week.  Please find some updated information below! CONTINUE READING



March 20, 2020

Dear Keystone Families,  

We would like to thank you for the outpouring of support the office has received in the past week. The Keystone Board of Directors deeply appreciates your patience, understanding, and flexibility.  CONTINUE READING



March 17, 2020

Dear Keystone Families,

On Monday, March 16th the Keystone Faculty, Staff, and Administration gathered together to discuss how to best support each other, our families, and our students in the coming weeks.  The time we spent together solidified what we already knew about our Keystone Family. We are committed to our students with the whole of our hearts and we will do everything we can to continue to support each and everyone of them while we navigate these uncertain times ahead. CONTINUE READING



March 15, 2020

Dear Keystone Community,

As we continue to navigate the COVID-19 spread, our goal remains the same - honest, open, and transparent communication with every member of our community and the continued care of each Keystone student.  Please rest assured that each decision of the Keystone Administration and the Board of Directors is made with the best interest of our students and the entire community in mind. CONTINUE READING



March 13, 2020 

Dear Keystone Community,

Pending Board approval, we have made the decision to close Keystone Montessori beginning Monday, March 16th through at least Friday, March 20th due to COVID-19 national and state emergencies that have been declared. CONTINUE READING

Additional resources

Provided by the Centers for Disease Control and Preventions:

Centers for Disease Control and Prevention