After 9 months of CA storage, ‘McIntosh’ apples from the first harvest demonstrated greater firmness and acidity retention than those from the second harvest (Table 2). As expected, 1-MCP helped maintain fruit firmness across all treatments. Early harvested ‘McIntosh’ treated twice with 1-MCP and held for 7 d at RT after CA storage had the greatest firmness retention, with 57.8 N after CA storage plus 7 d at RT. Moreover, earlier harvested ‘McIntosh’ apples without or with a single 1-MCP treatment were 53.4 N and 40.5 N, respectively, under the same storage conditions. In comparison, late harvested ‘McIntosh’ apples treated once or twice with 1-MCP or not treated exhibited 40.0 N, 43.1 N, and 36.5 N of firmness, respectively, after 9 months of CA storage plus 7 d at RT. None of these apples would have been acceptable for the fresh market due to low firmness values. These results suggest that using multiple 1-MCP treatments, once prior to CA and again after several months in CA, on early harvested ‘McIntosh’ apples can provide improved firmness retention during long-term CA storage.