planting vegetables

Hi Sharon, a lot of it depends on which hardiness zone you are in. If you're not sure you can check here:
http://www.usna.usda.gov/Hardzone/ushzmap.html.

Your carrots, radishes, and spinach should be fine to plant as soon as spring hits. I'm in zone 6 and planted my radishes about 3 weeks ago and they're doing ok (the ones in my cold frame are already about ready to pick though). I believe the others can be negatively affected by frost so you might want to wait until most of the frost danger is gone. If you're not sure when that happens I've found this site is really good for a general estimate:http://www.veseys.com/us/en/learn/reference/frost.

I hope that helps!