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By far the most common yellow raspberry is Allgold/Fallgold. I'd guess that's what you're most likely to have. I seem to recall hearing about a summer-fruiting yellow raspberry, but it is so obscure that I can't recall its name or where I saw it. I have been told that Allgold and Fallgold are the same variety, and that they are both just a (yellow) mutant form of Autumn Bliss. All three of the aforementioned are autumn fruiters, but, if the just-fruited canes are not pruned to ground level in winter, the old canes will fruit the following summer and new canes will fruit in autumn. However, rather than double the crop, it's more a case of getting a similar total yield, but spread over a longer season. Regardless of whether autumn-fruiters crop in autumn only, or in both summer and autumn, they do not have such as high yield as the summer fruiters. But on the other hand, the autumn fruiters seem to suffer a bit less from pest damage, so maybe not such a low yield as you'd think after pest losses to the summer fruiters. Pests are mainly birds or raspberry beetle larvae. Birds can be stopped with netting, but raspberry beetle larvae - if they attack - cannot be stopped without some kind of chemical spray. I have the above varieties and the yellow seem a bit more "different" to the red than I'd expect if they were all just variants of the same variety; for example, the yellow seem later to start growing each season. But maybe it's not just the colour which has mutated and the Allgold/Fallgold is a multiple mutant of the Autumn Bliss.
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