We’re just back from the last cruise of the season on Oceanwide’s Hondius, visiting the peninsula from Ushuaia 14-27 March, followed by the repositioning voyage via South Georgia, Gough, Tristan, St Helena & Ascension. This was our third visit to the peninsula after previous trips in October (by icebreaker) and in December/January.
Whilst March was a good experience it did not live up to our memories of the earlier visits which were truly spectacular. Certainly we saw many thousands of penguins on the peninsula, but many were moulting. There were virtually no chicks and none of the nesting behaviours that are so fascinating to watch. We had some great fin whale and orca sightings but, if whales are your priority, you can get better sightings in the northern hemisphere (eg Alaska and the Aleutians or Baja California) for a lower ticket price.
It was our second visit to South Georgia (previously December) and the Island was equally astounding on both our visits. King penguins breed year-round so tens of thousands of shaggy brown chicks are present whenever you go. Fresh snow in early April added to the scenic beauty
The Drake was smooth as silk southbound but the roughest we have experienced northbound, so I think you take your chance at any time of the year!
Hope this helps your planning.