The first sign of spring? DST -
Daylight
Stupid
Time. Pretending it's a different time than it is for 2/3 of the year. Why not for the whole year? Or would that somehow defeat "the purpose" of it? How about none of the time , like 2/3 of the other countries in the world? I know everyone is tired of hearing it, but I'm still going to complain about it. Now Germany is only 5 hours ahead of Michigan instead of 6, but since I haven't made a transatlantic call in 41 years, it doesn't make any difference.
The second sign of spring? I have crocuses, or croci if you prefer, blooming in my back yard. It seems like they used to be bluer, but I'm brain damaged and partly colorblind, so I can't be sure. If the grape hyacinth in the front yard ever comes back again it will be bluer and a lot darker than this. This isn't the same variety of crocus that saffron comes from, but if it was you can be sure I wouldn't mow it down. At around 20 bucks a gram, that comes out to ~$9,000 a pound. I would proudly pick a pound of powdery pistils.

Wouldn't you like to retire on saffron money and enjoy the rest of your life?
The third sign of spring? Spring will be here in about a week and a half. It's already in the 60s, but technically speaking, winter isn't over yet. And this IS Michigan, so anything is possible. I won't be taking the snowplow off my ATV just yet.
https://en.wikipedia.org/wiki/Crocus