Exterior Extension Cords
If your outlet is GFCI protected this is the first part of doing it safe, with 180' of extension cord you will need to use heavy duty cords some cords use 16 awg wire and at this length with a small or light cord there can be excessive voltage drop causing the blower to over heat and possibly trip the breaker. With a heavy gauge cord like 12awg it would be fine and possibly ok with a 14 awg cord but the size of the blower would be needed to know. With a GFCI and heavy cord it will be safe.