A colloquial expression meaning very early in the morning (often with a feeling that the time is inconvenient or surprising).
朝っぱらから大声で電話をかけるのはやめてほしい。
Please stop making loud phone calls first thing in the morning.
彼は朝っぱらからジョギングに出かけた。
He went out for a jog early in the morning.
朝っぱらから雨が降り出して憂鬱だ。
It started raining first thing in the morning—what a gloomy start.