Outdoor learning hours and executive function development in K–6 — a mixed-methods study

This four-year mixed-methods study (N = 412) examines the relationship between sustained outdoor instructional time and executive function development in K–6 students across eight schools in southwestern Ontario. Students in the treatment condition received eight or more outdoor instructional hours per week, integrated across all subject areas, while control-condition students followed standard indoor-curriculum delivery with one weekly outdoor period.

Quantitative measures included BRIEF-2 inhibitory control subscale, working memory tasks adapted from the NIH Toolbox, and provincial EQAO scores in reading and numeracy. Qualitative measures included semi-structured teacher interviews (n = 41) and classroom observation cycles conducted over six terms. We hypothesised that integrated outdoor time would correlate with executive-function gains beyond what is attributable to general physical-activity effects alone.

Findings: treatment-condition students showed statistically significant gains in inhibitory control (Cohen's d = 0.61, p < .001) and working memory (d = 0.48, p < .01) relative to controls. EQAO numeracy results improved by 8.2 percentile points on average; reading by 5.4. Qualitative analysis suggests the mechanism is not simply more movement but the kind of self-regulation demanded by unbounded outdoor environments. Implications for curriculum design and teacher preparation are discussed.

The body of literature on outdoor learning has, until recently, struggled with a measurement problem: programs that demonstrate clear affective gains — engagement, self-reported wellbeing, classroom climate — have often failed to produce statistically reliable gains on the academic measures that school boards actually report on. The result is a frustrating two-tier conversation in which proponents and skeptics talk past each other.

This study was designed to address that gap directly. By using the same instruments boards already trust (BRIEF-2, EQAO) alongside qualitative measures rich enough to surface mechanism, we set out to test whether sustained outdoor learning produces effects that survive measurement on conventional terms.

Methodology. Eight partner schools across southwestern Ontario participated. Four were assigned to the treatment condition (eight-plus hours of integrated outdoor instruction per week across all subject areas), four to the control condition (standard indoor curriculum with one weekly outdoor period). Cohorts were matched on socioeconomic indicators, baseline EQAO performance, and demographic composition.

Quantitative results. Treatment students showed substantial gains on inhibitory-control subscales (d = 0.61) and working-memory tasks (d = 0.48). EQAO numeracy gains averaged 8.2 percentile points; reading 5.4. The effect was strongest in students in the bottom quartile at baseline.

Qualitative results. Teacher interviews surfaced a consistent observation: the outdoor environment demanded a kind of self-regulation that indoor classrooms do not. Children had to make small, continuous decisions — about where to stand, what to attend to, when to ask a question — that aggregated into something close to deliberate practice in executive function. The classroom observations corroborated this.

Discussion. The data is consistent with a mechanism in which outdoor learning environments operate as a kind of cognitive scaffolding for self-regulation, rather than simply as a vehicle for general activity-related arousal effects. If the mechanism is correct, it has implications for curriculum design well beyond outdoor education programs specifically.

Limitations include the relatively small sample size of partner schools (N = 8), the inability to fully blind teacher-administered measures, and the regional concentration in southwestern Ontario. Replication across other geographies and demographic compositions is warranted.