Posted: 06/10/2014 at 17:38
You don't say what variety of pumpkin you are growing or whether outside or under cover but at this point in the year they should be almost ripe or at least well on their way to ripening. If you have any small fruits attempting to grow on the vines, remove them as they won't grow much now and will take vigour from the vine.
As a general rule for winter Squash/Pumpkins, once you have the number of fruit you feel the vine will support and which you think will ripen, remove other fruits and trim back the vine. Whilst the leaves remain green and healthy, leave them on. Sad to say, if 2 of your pumpkins are still green at this time of year, it is rather unlikely that the will now ripen sufficiently.
Hope this helps