Zucchini and yellow crookneck squash should cross quite easily. They are both members of the "pepo" species. As to the viability of the seed around your burn pile, mature crookneck squash lay on my zone five all winter and were tilled under this spring. I have volunteer squash everywhere.

I crossed the two and it looked like a zuke with slight yellowing in it like this
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and it was very very tasty I thought I am planing on growing it out to get a stable hybrid I liked it so much

Try "golden zucchini " it is a cross between summer squash and zucchini. It was around years ago . Close enough?

Using clothespins to keep blossoms closed, I intentionally crossed Gold Rush zuchinni with Yellow Crookneck last summer. Made plenty of seeds.

I am encouraged by 1angel3's similar success. My plan was to make some F2's and perhaps backbreed again to crookneck, my favorite summer squash taste.

Gold Rush was so pretty a yellow color, I hated to not do "something' with it, so I played squash-pimp!

First time poster but long time lurker with a similar question.

Yellow squash and green zucchini grew not too far away from each other last year. This year what looked like a zucchini plant popped up on the other side of the garden in between beets and kale. My friend wanted to see what happened so we let it go.

Out popped this yellow green striped thing that we assumed was a yellow squash/zucchini mix.

Only thing is it has tiny spikes like a cucumber. I read somewhere that cucumbers and zucchini don't cross. Would love to hear from the experts as the curiosity is up around here. It tastes like a slightly sweeter zucchini.

Cukes can cross with melons occasionally but rarely . They can not cross with squash or surprisingly even "gherkins".
You could cross this with a Big max pumpkin (squashkin). Not only would you get Zucchini flavor but enough to make lots of Zucchini bread . It may take a few generations to get all the right traits .

Thanks Farmfreedom. The plant popped up about 12 to 15 feet from a Jarradale pumpkin vine that is crawling down one end of my rows. Don't know if that is close enough for something to happen naturally. I have never tried to purposefully cross something. Hmmm.

I crossed what I thought was a Grey Zucchini & Yellow Squash because I grew them both in the same patch and the outcome was a mostly "yellow" squash but smooth with blocthy/mottled stripes like the Grey Zucchini.

My Gold Rush zuke X yellow crookneck hybrid seeds grew well enough the next summer and was a fabulous summer squash, if you are into taste-free squash!

Hope nobody else repeats this cross. Taint worth it!

The yellow zucchini skin is somewhat tougher than that of the green variety. So I often wonder if the yellow zucch is a hybrid of the green zucch and a yellow squash like a spaghetti squash - not necessarily a 50/50 hybrid.

Hi, I've read on several sites that's impossible to cross pollinate cucumber with squash. Well, unfortunately, my garden has been taken over with a squash like vine yielding a fruit that looks a miniature pumpkin, but tastes like a cucumber. It has all the characteristic of a cucumber, except that it the shell or skin is thicker than a cucumber about what it would be like with a summer squash or zucchini (the seeds are like cucumber, but slightly larger, and yet smaller than a squash). So, I'm baffled as to how this is possible, if all the experts are saying that it can't happen. I planted the summer squash next to a cucumber and tomatoes. Would be interested in some feedback as to what it might be.

P.S. the patch took over the tomatoes and other plants, but yielded for its quantity of flowers, only a few fruits thus far. It's edible, and not bad, and almost perfect round shape like a tomato.