Can anyone identify this? It came from a volunteer vine

[sinkingfeeling]

in my backyard.

[Think. Again.]

1. Unripe cantalope?

[bucolic_frolic]

2. I think it's a squash

but the dull smooth green is confusing. Kombocha?

[sinkingfeeling]

10. Not Kombocha, I have one those sitting on my counter right now.

[Bayard]

3. Some type of winter squash

[ratchiweenie]

4. Some sort of winter squash. Bake it and see if it's tasty.

[ShepKat]

5. blue hubbard

either a small regular one, or there is an heirloom called 'baby blue' hubbard. let the seeds dry and plant next year if you want

[sinkingfeeling]

11. I think you're right.

[ShepKat]

12. me too-

I am an heirloom seedsaver for the last 30 years
I used to sell them on localharvest.org

[BlueTexasMan]

6. not sure, but

I believe it's a wild gourd. They're seen growing beside the roads often.

[cachukis]

7. Unfinished Blue Hubbard. Save the seeds. Best pie in the world.

[Emile]

8. It is squash for certain. What type, no idea.

Maybe yellow?

[nebby70]

9. agree - most likely a blue hubbard ..

...it appears to have a small flesh to seed ratio ...
... could well be a 'volunteer' of a previous season's hybrid species; which means it is a parent, and seldom best quality...
... unless you have ample space (all gourd family plants are garden hogs) I wouldn't plant the save seed of this...
... however, the seeds can be tasty when dried; and of course the flesh from this one is may have a good taste when roasted...

[cachukis]

14. Makes sense.

[MiHale]

13. Last year my zucchini and acorn squash...

Got together and had some fun under the leaves. They cross pollinated, I had no idea the acorn squash seeds I saved from the fruit must have been contaminated with zucchini “DNA” .
Because this years seeds did really weird stuff…some are round Acorns squash no problem…some are zucchini with a slightly harder skin, if picked early it’s fine, if not inedible…but some of those are showing characteristics of an Acorn, albeit oblong…we”ll see.

I sliced open one of the squash’s and it looked similar to those pictures.