In sagebrush ecosystems, surface soil nutrient availability, particularly of N, often increases immediately following wildfire. Less is known, however, on how soil N availability and other nutrients change over time post-wildfire. In Oct., 2013 a wildfire approximately 30 km north of Reno, NV occurred in a mountain big sagebrush community. We quantified soil nutrient availability in surface soil (0-10 cm) by microsite (burned and unburned shrub canopy, burned and unburned shrub interspace) and temporally (monthly from Nov., 2013 through May, 2015). Changes in nutrient availability due to wildfire largely occurred in sagebrush canopy microsites. For most months and relative to unburned sagebrush canopies, the burned sagebrush canopies had elevated availability of mineral N (dominantly NH₄⁺-N), bicarbonate-extractable P, DTPA-extractable Mn, solution-phase Ca⁺², Mg⁺², SO₄^-2, K⁺, and ortho-P. In a complimentary post-fire rehabilitation study, burned canopy microsites fostered greater seedling density and plant growth than burned interspaces, possibly due to greater availability of N, P, and other nutrients. The longevity of elevated nutrient availability, due to wildfire, may partially be due to an extended period of drought in northern Nevada.