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Provided you're using an appropriate starter fertilizer for grass seed, you can put down seeds and fertilizer at the same time. However, putting them down separately, one after the other, on the same day will help to avoid over- or under-applying the lawn food. Avoid using a fertilizer with weed control elements, as these will likely keep the grass seeds from starting.  

Yes, some grass will germinate in two weeks or less but it will take several weeks more before it is established enough to walk (or nap) on. To grow grass quickly, follow the tried-and-true-steps carefully, starting with choosing a cool- or warm-season grass seed that flourishes in your home’s climate.

You can reseed a lawn that has dead grass, but it is best to remove the dead patches before you begin. Removing the dead turf and testing the soil will help you determine what is killing the grass so you can make the necessary amendments to prevent the problem from recurring. Once you have made the appropriate adjustments, you can rake, fertilize, and reseed. If your lawn has many large dead patches, it may be more effective to remove all the existing grass, amend the soil, and start over from scratch.

The best time to plant grass seed depends on your local climate and whether you have cool-season or warm-season grass.

For cool-season grasses (like tall fescue), the ideal time to seed is late summer or early fall (typically August and September). During this period, the soil is still warm from the summer, but the air is cooler, creating optimal conditions for germination and root establishment before winter. There is also less competition from weeds. Spring is a secondary option, but cooler soil temperatures, the risk of a late frost, and less time for the grass to mature before summer heat can make it less successful.

For warm-season grasses (like St. Augustine), the best time to plant is from late spring through mid-summer (typically May and June), when temperatures are consistently between 75 and 90 degrees Fahrenheit.

In general, it is best to avoid seeding during winter or early spring, as cold soil and air can prevent seeds from germinating. For recommendations tailored to your specific grass type and climate, consider consulting a local lawn care professional.