There are regulations, laws and codes at the federal, state and local level that govern open air fires.
The Virginia Department of Forestry has posted their annual burning restrictions. Below is a synopsis of the regulation. Please see their website for all the details. VA Department of Forestry
FEBRUARY 15 – APRIL 30
MAXIMUM FINE $500.00
BURNING LAW IN BRIEF:
1. No burning until AFTER 4:00 p.m. if within 300 feet of woodland or grass brush land leading into woodlands.
2. Fire must be attended at all times if within 150 feet of woodland or grass or brush land leading into woodland.
3. No fuel may be added or fire rekindled after midnight.
4. Law applies to camp fires, warming fires, brush piles, household trash, stumps, fields of broom straw and brush, or anything capable of spreading fire.
The local Spotsylvania County municipal codes can be found here: