It could be anywhere from weeks to years for a dead tree to fall. A dead tree falls based on its weight, how it leans, the state of its roots, the state of decay, and what local windstorms are like, among other factors. Since it’s hard to predict the fall’s timing, it’s important to cut down a dead tree quickly and avoid any unpleasant surprises.

Pruning trees during the summer can be a bad idea because the new growth will take place during the hottest months of the year, which can stress your tree out. Similarly, pruning during the early fall can be a bad idea, too, because you’d be stimulating new growth when most trees are aiming to go dormant. 

Pruning recommendations will vary by the type of tree, but generally, waiting until winter to prune your trees is a good idea.

Rock salt or Epsom salt can damage and kill tree roots over several weeks and can even assist in removing the tree's stump. However, you need to drill holes or cut into the stump and surface tree roots to inject them properly with the salt. Repeat the process every two weeks until the roots visibly rot away.

Hiring an arborist costs around $900 on average, with prices ranging from $250 to $2,500 or more. Some arborists charge an hourly rate, typically between $100 and $350 per hour. The final cost depends on several factors, including the type of work, the number of trees, accessibility, and whether you hire an independent arborist or a larger tree service company. When hiring, you should also consider their experience and insurance coverage.

Below are some estimated costs for common arborist jobs:

• Small tree removal: $300 to $500

• Large tree removal: $500 to $2,000 or more

• Tree health assessment: $150

• Trimming a small tree: $75 to $200

• Trimming a large tree: $150 to $400

• Dealing with invasive species: $150 to $1,000 or more