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Those who live in between zones may have summers too warm for many cool-season grasses and winters too cold for warm-season grasses. Grasses selected for these climates must be well adapted to both conditions, so opt for tall fescue if your area is more prone to very cold temperatures or kikuyu grass if your home has notably hot summers.

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.  

For optimal results, water newly planted grass seed at least twice a day—once in the morning and again in the late afternoon. The goal is to keep the soil consistently moist for the first two weeks, but be careful not to overwater or flood the seeds. After about two weeks, you can reduce the frequency to once per day. Always monitor weather conditions and adjust your watering schedule accordingly; for instance, you won't need to water as much if it rains.

Depending on the lawn treatments, the best times of the year to redo your lawn are between mid-August and mid-September for overseeding and renovation treatments. For areas such as the southern United States, lawn aeration works best during the fall, when the temperatures begin to drop. Otherwise, early spring is your next best bet because the grass is fresh and ready to absorb nutrients, and the temperature isn’t hot enough to fry the grass and the renovation materials.