Sure, it's Spring and the weather is warming up, but you should be prepared for a sudden blast of leftover Winter all the same. Is your propane or fuel oil tank still full enough to handle an extended cold snap? Be sure, and get them topped off so you're ready - just in case. Likewise see that your car's tank is full. It'd be no fun at all to be caught short in sudden Spring storm that doesn't know it's not Winter anymore. Take the gas can for the snowblower along and top that off, too.
But also prepare for Spring and Summer. If the weather is nice, you might want to grill. So be sure that the propane tank on for the gas grill is full as well. Or, if you don't have a gas grill, make sure you're ready with a sufficient supply of charcoal - and don't forget to check up on your lighter fluid too.
Don't wait. Don't put it off and get caught short later. Today is April Fuels Day, after all.