Spring was a season on Earth, and other planets with tilted axes, that took place in the early months of the year.
When Romulans abducted and brainwashed Geordi La Forge in 2367, they fed images of a spring day on Earth with a beautiful meadow, green trees, birds and a blue sky directly to his visual cortex. (TNG: "The Mind's Eye")
In his role as Emissary of the Prophets, Benjamin Sisko held a ceremony to bless the women on Deep Space 9 who wanted to have children every spring. (DS9: "Strange Bedfellows")
Michael O'Brien remarried in the spring of 2369. (DS9: "Whispers")
Spring on Gaia came early in 2373. (DS9: "Children of Time")
In 2374, after hearing that Worf and Jadzia's wedding was to take place in six days, Julian Bashir commented that "there's nothing more romantic than a wedding on DS9 in the springtime". (DS9: "You Are Cordially Invited")
Later that year, Tom Paris suggested to B'Elanna Torres that they go skiing in a holoprogram of Chile in spring. (VOY: "Waking Moments")
In 2376 Dala claimed she made a pilgrimage to Narva each spring honoring the Redeemer of Light. (VOY: "Live Fast and Prosper")