Timing on possibly selling my home

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Hi, I live in a close-in Seattle neighborhood: Ballard 98107 in a two bedroom home that Zillow values between 8-something K to 9K. I've always been told you must sell in the spring. I suppose that means April May June. Is it really that big of a deal if I have to delay it it and sell in July or August? I will lose a significant amount? This is a neighborhood where houses go quickly. Because of "life stuff" I just may not be ready immediately. It's May 21 as I write this. Any advice / opinion appreciated.