From the Colorado State University Extension Service:
https://extension.colostate.edu/topic-areas/agriculture/soil-erosion-control-after-wildfire-6-308/Erosion Control Techniques
The first step after a wildfire is reseeding grass in the severely burned areas. Remember many plants can recover after fire depending on the severity of the burn. It is important to leave existing vegetation if the plants do not threaten personal safety or property (hazardous trees in danger of falling should be identified first).
Seed can be purchased throughout Colorado. It’s a good idea to obtain certified (blue tag) seed – this guarantees the variety, that it was tested under field conditions, and that it is recommended for the state.
Varieties recommended (this is not an all inclusive list) include mountain bromegrass, slender wheat-grass, bluebunch wheatgrass, western wheatgrass, Arizona fescue, streambank wheatgrass, Idaho fescue (western slope), thickspike wheatgrass, steambank wheatgrass, and blue gramma. Species selection will vary from one site to another. Species selection is based on soils, elevation, aspect, and location in the state. You may plant a nurse crop with the grass mix to provide a quick cover (oats or a sterile hybrid such as RegreenTM or QuickGuardTM) until the native grasses germinate.
Seeding Tips for Hand Planting
1. Roughen the soil surface to provide a better seedbed by breaking through the hydrophobic layer. A steel rake works well for this, or, depending on the slope, a small tractor drawn harrow could be used.
2. Broadcast the seed (a “Cyclone” seeder works well). Seeding rate depends upon the variety of seed sown. A good estimate is 10 to 20 pounds per acre of grass seed with another 10 to 15 pounds per acre of the nurse crop.
3. Rake or harrow in 1/4 inch to 3/4 inch deep.
4. If the area is small enough, roll or tamp the seed down to ensure good soil/seed contact.
5. Spread certified, weed-free hay straw. If the area is small, crimp the hay in with a shovel. (This will help keep soil, seed, and mulch in place during wind and rain.)
6. Control weeds as needed by cutting off the flower heads before they can produce seed.
7. Do not use herbicides for broadleaf weed control until after the grass has germinated and developed five leaves.