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Fact-check log

Each factual sentence used on this site is stored with a source and with the phrases that must appear in the cached excerpt. All 21 claims were checked on 15 November 2026.

• Arctic and alpine tundra are kept distinct. Growing seasons of 50 to 60 days (Arctic) and about 180 days (alpine) come from the same National Park Service Arctic-overview page, and are not averaged.
• Rocky Mountain National Park’s own dates — snow into June, flowers from late May to early August, a July average high of 52°F — are labelled as that park’s figures, not as a universal alpine calendar.
• Permafrost under Arctic tundra is described from that overview page and from Rocky Mountain National Park. For alpine tundra, “typically does not have permafrost” and “patchier within alpine tundra” are both shown.
• Latitudinal treeline, the Arctic Circle, and “north of the permafrost line” are kept as the wordings of their own pages. Photographs are captioned as Arctic or alpine, and as the park or refuge named on the file.

The claims themselves are listed, with their sources, in the generator used to build this site.