Livestock grazing at different times can impact plant and arthropod communities in high-elevation grasslands. A study in Montana showed that both early and late grazing reduced forb and graminoid plant biomass. The density of Hemiptera arthropods was also decreased by grazing. Grazing earlier in the season did not lead to better plant recovery as expected. Overall, grazing, regardless of timing, reduced plant biomass and arthropod populations in both wet meadow and upland grasslands. This suggests that both early and late season grazing can have similar effects on plants and arthropods in high-elevation grasslands.