[6] Natchaug has offered bilingual education for Spanish-speakers for forty years, since the 1980s,[7][8] in accordance with state legislation.

Natchaug has held an annual Field Day (día de campo) at the end of each school year for many decades.

[2] For comparison, the Connecticut public school average is 43% of students being enrolled in the lunch program.

[17] The city of Willimantic lies in an area that historically was home to several Native American groups, including the Nipmuc people, from whose language the name derives.

The school was initially a large wooden building, completed in 1864 to replace the old stone schoolhouse that had served the students on the east side of Willimantic since 1831.

[20] Visiting students included Chang Yau Kung, Won Bing Chung, and Sung Mun Wai.

[23] At the height of the COVID-19 pandemic, classes in all Connecticut public schools, including Natchaug, were taught remotely.

In response to the pandemic's impact on children's emotional well-being, Natchaug's teachers used a puppet-based model for helping students learn to recognize and manage feelings.

[25][26] In September 2023, a heat wave caused Natchaug and other schools across the state to close due to unsafe temperatures in the facilities.

[26][27] Earlier in 2023, due to the wildfires in Canada, poor air quality caused Natchaug to have to reschedule its annual Field Day.