We need more info.
Where do you live (location and zone), what kind of grass do you have, do you irrigate?

I live in Chicago, I am not sure what kind of grass I have, but I most recently tried to reseed with a shade mix. I do not irrigate or have irrigation.

Im not good at the cold season lawns or warm season lawns for that matter. Im in florida and my lawn is a mess too. Someone will help ya out.

I'm no expert, but maybe my questions will give a bit more insight to those that are :) Did this just start happening, or has your lawn been stressed like this and for how long? Seems that it just needs some TLC. Good watering schedule. Maybe a soil test to see what is in your soil, or lacking. My lawn was pretty much dirt,and now it is 75% filled in. It still needs to thicken up, but not bad from October to now for the progress due to TLC.

Thanks, it's been a slow downward spiral, it's never been perfect though and I think that has to do with grading and tree roots. I thought hiring a lawn care provider would help last year but it's gotten worse. I never really paid attention to watering regularly though, maybe that's the ticket. Did you apply seed at all?

Here have been my results from October (dead grass pic) to March. I still need a whole section to fill in, which is already doing so due to the warmer temps.

I did throw some seeds (big box store brand), but those seeds really never germinated cause I didn't throw a level of topsoil over it. I never saw any new grass growing for that matter and my grass is common bermuda. I started watering twice per week, about 45min to 1 hr using an oscillating sprinkler. This was back in october, and then cut back to once per week during the winter. I live in south Texas, so winters here are summers in your part, lol. I didn't really have any lawn knowledge up until about 1 month ago, when I found this forum. I barely did the "tuna can" test to measure out how long it takes for 1in of water to to hit the lawn. This was DC Halls recommendation. To my surprise, it takes about 2.5 hrs! So for the past 2 weeks I have been watering like this. I need to invest in more sprinklers (no sprinkler system here) to help speed up the process and not waste water to sidewalks on areas that are narrow in the front lawn. Depending on your region and temperatures, watering schedules may differ. We are already hitting 90's here! I suggest you do the tuna can test and time your watering. This has made my lawn turn lime green to darker green. So far, without the knowledge, I have applied 2 high nitrogen ferts. One in first day of Spring, the other 1 month later in April. My lawn started turning light/lime green due to a lot of rain and no sun for almost an entire month (not common). I sprayed liquid nitrogen (20-0-0) Last week, and boom, dark green is coming back. I'm in the process of getting a soil test to try to improve my soil. I'm also thinking of going organic, as it is safer and want to say cheaper! If you look for my thread of "alfalfa before and after pics", DChall posts some pics there that I believe is Morpheus lawn on an organic program. WOW!! is all I have to say :). Good luck, hopefully more chime in, as I'm a newbie to lawn care.