As a rule, I follow the Wheel of Seasons for the harvest correspondences. Early summer is for sowing, late summer for reaping, winter is for conserving until the solstice, then you share from what you have saved up because you know more is coming soon to replace it. It's metaphorical but it's not, it's very literal outside of the fact that I'm not a literal farmer.
I think it's also relevant to add that I factor in the phase of the moon too. Waning moon is for pushing away energy, waxing moon is for pulling it in. Full moon is the time to empower, finalize or otherwise give a working that "last push". New moon is a time for cleansing or beginning a new working. So for example, I'll start designing a sigil around the new moon, finalizing it and empowering it on the full moon. I use a 72-hour window for the new/full moons for my workings.
Transition seasons are a time to ground in nature. I engage with the world as though there are two seasons, each lasting for approximately six months. Summer and winter. Spring and autumn last for somewhere between two weeks and a month, so I don't acknowledge them as their own seasons typically. I do appreciate them as they pass by though.
eta: Oh, and while I do pay respect to the solstices, I follow my own internal calendar for the seasons. I'm known among friends and family for watching the weather and suddenly announcing the season has changed, regardless of how long the calendar says there is until the official start. I'm right more often than not.