Answer: Although a cold frame can be very useful for hardening off seedlings and transplants prior to setting them in the garden proper, often they are nearly as much work as an indoor project would be. The reason for this is the frame must be opened on sunny days to avoid excessive heat buildup and then covered nightly to hold warmth in and possibly even insulated on cold nights. The plants also need careful monitoring for watering and other similar needs. Starting seeds so early will risk very cold weather and without supplemental heat, they may freeze.
For these reasons, in my experience it is actually easier to start seeds under the more easily controlled indoor conditions.
The easiest solution might be to either plant the seeds directly in the ground, where they will germinate and grow on naturally. Then you could transplant the seedlings when the pansies are ready to come out. Another possible easier solution would be to purchase transplants and pop them in when the time comes.
Sometimes gardening is just plain fiddly. I wish I had a better answer for you.
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