Exhibit 99.1 Granite Reports First Quarter 2024 Results • Q1 revenue increased 20% year-over-year to $672 million • Q1 diluted EPS of$(0.70) and adjusted diluted EPS (1) of $(0.21) • Q1 operating cash flow increased$101 million year-over-year to $24 million • Reorganized operations to align leadership with reportable segments WATSONVILLE, Calif. - Granite Construction Incorporated (NYSE: GVA) today announced results for the quarter ended March 31, 2024. First Quarter 2024 Results Net loss attributable to ...