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The amount of time it takes for grass to germinate varies depending on the grass species. Even after germination, it’s going to take a while to see grass blades start emerging from soil. Some grasses germinate quickly and emerge after several days of growth (and healthy watering). Others may take up to three weeks to show themselves. Cool-season grasses tend to take the longest to germinate at one month.

Yes, it's common for lawns to look bare after dethatching. Dethatching brings soil to the surface to create a "bald" look on your lawn. While you may choose to patch or reseed your lawn if bare patches seem excessive, it's normal for a lawn to look bare after dethatching. With the layer of debris that was blocking water, nutrients, and air from reaching your grass now gone, your lawn is likely to grow better than ever.

This depends on the type of grass seed, as some types do better in different environmental conditions. Cool-season grasses go dormant during the summer months when the soil temperature exceeds 65 degrees Fahrenheit. Once exposed to regular doses of heat, the germination rates decline, with seedling death not far behind. 

As for warm-season seeds, they come from tropical parts of the world and thrive in heat. They actively grow in warm air temperatures between 70 and 90 degrees Fahrenheit, and they prefer soil temperatures between 65 and 70 degrees Fahrenheit. Once temperatures dip and frost rolls in, if you don’t store them properly, warm-season grass seeds will die quickly.

The easiest way to rough up soil to accept grass seed and provide the best opportunity for its growth is to make several passes over the area with a garden tiller and rake away the loosened vegetation and debris. However, in some cases, very hard ground may require using a shovel or pick to break up pieces into smaller chunks that the tiller can handle more easily.