Beekissed
Mountain Sage
When is the best time to lime? Early spring? And should I looks for finely crushed lime (powder) or is barn lime sufficient?
Early spring, before the grass gets going well...try to spread it when you'll have 2-3 days of dry weather. Later on, when the grass is dying back at the end of summer and early fall is also a good time to spread it again. You'll want it to make good contact with the soil.
I usually just use garden lime, aka sweet lime. Can find it at Lowe's for around $3-$4 for a 50 lb bag.