You could instead try indicating where you are geographically and then asking about experiences of others with those plants in the same region on this and other web sites with forums. You could also try asking about them at independent nurseries in your area; of course, success with this depends on speaking with someone who knows what you want to find out - but if you have organized special plant sales with multiple micro-nurseries participating you can often talk to the growers themselves at these affairs (rather than underpaid, seasonal sales clerks). Many will be enthusiasts with experience of many different kind of plants - except for those that are narrowly focused on one particular kind, say tomato plants or fuchsias.

In my opinion, there are vendors that will make plants more compatible than others. You learn to trust some vendors based on recommendation and experience. I use Fedco because they are in the Northeast US close by (and because I trust them well enough). If nothing else, the safest approach is to pick the apparently most conservative guess. Where I live, I usually worry more about what will die in the winter than what will bolt in the summer. Not sure what part of the world you are in, though it might help with getting recommendations from other people.

I have a list of a bunch of ''zone''maps at AHS Plant Heat Zone Maps by State. - Vegetable Gardening Forum - GardenWeb which may be useful or just add to the confusion.

Sunset zones often incorporate the most detail including such factors as altitude.

I have a list of a bunch of ''zone''maps at AHS Plant Heat Zone Maps by State. - Vegetable Gardening Forum - GardenWeb which may be useful or just add to the confusion.

Sunset zones often incorporate the most detail including such factors as altitude.

this is not for free - you'll need to pay for a detailed copy, but you can see a general map at least.
if you plug in am..hort.soc.."heat zones" and look for images you'll see lots of maps. perhaps you can find smth more detailed for where you are or what you're interested in.

Here is a link that might be useful: american horticultural society heat zones

there is also this:
plantzones created an on-line interactive map of North America that allows the user to turn on the heat zones over a Google Map of North America. It also has a "plant selector" that can show where a plant is adapted based on climatic data.
i haven't tried it myself, but at least you can explore

Here is a link that might be useful: plantzones

the site below gives you a portion of the heat zone map by state.
there is also a book "Heat-Zone Gardening" that has a list of plants.

Here is a link that might be useful: heat zones by state