Just like when you take your boat out of the water before winter to avoid ice damage, seaplanes need the same treatment too. Some seaplanes are amphibious which means that they have retractable wheels to allow them to land at any regular airport too, but for those that are straight up water planes, once the ice melts again ya gotta get them back up in the air. Here's how they do it...

 

 

And here's another one...

 

 

But how do you get them onto land in the first place at the end of the season?

 

 

So, if they can land on the grass, can they take off from there too? Yup.