Climate change is making spring bloom timing unpredictable.

Yes, climate change is affecting when trees bloom, but the differences between species are mostly hardwired genetics.

Every tree species has its own internal calendar. Some bloom early to get bugs before competition shows up. Red maples, for example, flower before their leaves even emerge. Others bloom later to avoid late frosts or because they’re waiting for specific pollinators. That timing is mostly set by a combination of winter chill hours and spring warmth.

Climate change throws a wrench in that. Warmer winters mean some trees don’t get enough chill time, so they delay or bloom weirdly. Others that rely on temperature cues get pushed earlier. The result is a messy, not-synchronized spring — early bloomers may flower before their pollinators are active, and late bloomers might miss the window entirely.

So when you see one tree covered in buds while the one next to it is still bare, it’s partly genetics, partly microclimate, and partly the global climate screwing with the schedule.

Watching when your local trees pop is a cheap way to spot climate change