Welcome to the forum
As outdoor piggies they need hay everywhere in the hutch for warmth. You can push the hay and shavings to one side if you’re opening the ramp but I would still recommend it is used. It’s still too cold for them while temperatures are below 15 degrees.
(Personally, it is one of the reasons I don’t like hutch-ramp-run combos like this - there can be several aspects which are trickier to manage).
Can I ask, are they used to eating fresh grass and have you tested the grass to ensure it’s warm enough for them to be out?
You need to be very careful with grass time at the start of every year/after time off of grass during autumn/winter - too much (particularly rich spring) grass too soon and on unprepared tummies can cause bloat so you need to build their access to it up very slowly.
I start mine (also live outdoor but in a shed) by handpicking grass from around February and feeding it to them in their shed. It hasnt been warm enough under foot for them to be out on the grass yet, but once it is, they go out for 10 minutes a day for the first week, and then adding in another 10-15 mins a week and building time up slowly over weeks to months, so that by mid summer they are able to be out all day.
To test if it’s warm enough for them to be on the grass, the outdoor temperature needs to be above 15 degrees and you need to be able to stand on the grass with bare feet without feeling cold or damp. If you can’t, then they can’t be on it yet.
I would also add that the pink igloo may be a risk for several reasons - the main one being that as a one exit hide, we do not recommend their use particularly for teenage boys. All hides should have two exits so that neither pig can trap the other inside it and risk causing a fight.
We also dont recommend the use of plastic hides outside due to the risk of condensation/damp in winter and the heat they trap in summer. Wooden (two exit) are much better for outdoor dwelling piggies
Feeding Grass And Preparing Your Piggies For Lawn Time