Summary:
Zip code 83110 has two Afton high schools serving grades 9–12: Star Valley High School and Swift Creek High School, both in Lincoln County School District #2. The clearest difference for families is in the latest reported grade 10 results: Star Valley scored higher than Swift Creek in every subject, by 30.6 percentage points in English language arts, 41.3 in math and 36.5 in science.
Star Valley stands out at the top: its 2025–2026 grade 10 results were 65.6% in English language arts, 51.3% in math and 66.5% in science, each above the state rate. Swift Creek was below state rates in all three available grade 10 results, with 35% in English language arts, 10% in math and 30% in science. The difference also appears in graduation: in 2024–2025, Star Valley’s rate was 93.2%, compared with Swift Creek’s 72.2%. SchoolDigger ranked Star Valley 16th of 81 schools (4 stars) and Swift Creek 73rd of 81 (1 star) for 2025–2026.
Star Valley remains ahead, though its results show some mixed movement: between 2024–2025 and 2025–2026, grade 10 math fell from 54.3% to 51.3%, while English language arts edged up from 65.1% to 65.6% and science rose from 64.8% to 66.5%; its average advantage over the state across comparable grade 9 and 10 results narrowed from 15.4 to 11.3 points. Swift Creek’s grade 10 English language arts result improved from 27.8% to 35%, but remained below the state. Swift Creek also has a lower student-teacher ratio (10.2 versus 16.4) and higher spending per student ($23,197 versus $17,604), alongside a higher free/reduced-lunch eligible share (52.8% versus 21.6%); these are contextual differences, not explanations for outcomes. Swift Creek’s current grade 9 scores are suppressed, so its grade 9 performance cannot be compared.
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