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There are two types of tundra, the same page says: arctic tundra is above latitudinal treeline and alpine tundra is above elevational treeline. [NPS Arctic] For Arctic tundra, the Park Service says the growing season ranges from just 50 to 60 days. [NPS Arctic] For alpine tundra, the same Park Service page says the growing season is approximately 180 days. [NPS Arctic]

Arctic tundra is underlain by a layer of permanently frozen soil called permafrost, which is permanently frozen ground that affects nearly everything in the Arctic ecosystem, including soils, vegetation, water, and wildlife. [NPS Arctic] Permafrost, which the park defines as an area with a permanently (year-round) frozen subsurface soil layer, is common and widespread in arctic tundra, but patchier within alpine tundra. [NPS Rocky Mountain] July is generally the warmest month on the park’s tundra, with an average high temperature of 52°F (11°C). [NPS Rocky Mountain]

A longer sitting-together of those figures is on the year-wheel desk.