We started publishing our Trulia Trends reports in January 2007 and we will continue to publish them each month. There is nothing implied by the fact that reports don't exist for dates prior.
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2. There are plusses and minuses to listing a home in late winter/ early spring. Spring and Summer see more sales, but also more competition, while Fall and Winter typically have fewer buyers, those buyers HAVE to buy, usually.
3. Yes, it's dependent on the time of year you are on. Wait a few months and you'll see August pop up. Most sales information is not real time. Our tax records show MAY 07 right now. So next month I'll know what sold in June, then July ... etc
My guess would be that they only show the last six months. Most comps use six months or less. I would say less in this market. Depending on what your search was, if you were looking up past sales, it may only go back six months.