I created this table to help me when deciding what to eat at events. All the foodstuffs included here are authentic - referenced from floral and faunal assemblages in excavation reports and contemporary written records. Availability is based on the modern growth period, but as the climate was slightly different back in the Dark-Ages, this table may not be 100% accurate. It's a start though. . .
 

Dark-Age fruit and vegetables would have been much smaller than the ones we have now, although, being grown organically may have tasted better!

 

Also, many fruits and vegetables could have been dried and stored, and thus would be available in the months when fresh foods weren't.  See the 'non seasonal' section for comments on this.

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It is important to remember that food was regional as well as seasonal.  So if you lived by a river you could eat more fish than a person living inland, for example.  Non seasonal foodstuffs are at the bottom.