Lilies are generally “in season” in gardens from late spring through late summer, but the exact timing depends on the type of lily and whether you mean garden blooms or cut flowers.

When Are Lilies in Season?

Lilies have different blooming windows depending on the variety, but most true lilies (genus Lilium) flower sometime between late spring and early autumn. In the cut‑flower trade, though, lilies are effectively available all year because growers use staggered bulb forcing and global production to keep them coming.

Quick Scoop (Garden Bloom Times)

For garden lilies in temperate climates (Northern Hemisphere):

  • Early season (late spring to early summer) – Many Asiatic, LA (Longiflorum‑Asiatic), Martagon and species lilies start the show from around May to June in many regions.
  • Mid season (early to mid‑summer) – Trumpet lilies and many Oriental‑Asiatic hybrids tend to bloom in mid‑summer.
  • Late season (late summer to early autumn) – Oriental lilies, Tiger lilies, OT (Oriental‑Trumpet) hybrids and some species lilies bloom from late summer into early autumn if conditions are right.

One practical way gardeners think of it: if you mix early, mid and late types, you can have lilies flowering almost continuously from roughly June through September.

Season by Lily Type (Garden Context)

Here’s a simple way to look at timing by type:

  • Asiatic & LA hybrids – Among the earliest; often bloom from late spring into early summer.
  • Martagon & many species lilies – Also early‑season bloomers in late spring or very early summer, especially in cooler climates.
  • Trumpet & Longiflorum types – Typically mid‑summer bloomers.
  • Oriental & OT hybrids (Oriental‑Trumpet) – Usually late‑season, flowering in late summer and sometimes into early autumn.

One article notes that if bulbs are well fed and conditions are good, blooming of some lilies can extend from July into September, especially in monsoon or wetter summer climates.

Cut Flowers: “In Season” All Year

Florists often treat lilies as an almost all‑year flower because:

  • Bulb growers stagger planting and chilling so lilies can be forced to bloom at different times.
  • Production in both hemispheres means someone’s summer bloom can supply another region’s winter demand.

So even though garden lilies are naturally summer bloomers, you can usually buy lily stems from a florist in any month of the year.

If You’re Planning Around Them

If you’re asking “when are lilies in season” to plan a garden or event:

  1. For a summer garden display
    • Plant a mix of early (Asiatic, LA), mid (Trumpet, some hybrids), and late (Oriental, OT, Tiger) lilies to stretch color from early summer into early autumn.
  1. For a specific event date (weddings, parties)
    • In most temperate regions, the safest “natural” window for local outdoor‑grown lilies is mid‑summer.
 * For off‑season events (late autumn, winter, early spring), rely on florist‑supplied lilies, which are grown and timed in greenhouses.
  1. Indoor potted lilies
    • Lilies normally bloom once a year and still need a cold rest, but with controlled dormancy timing they can be coaxed to flower at different times; many still follow a summer‑leaning schedule.

TL;DR: In gardens, lilies are “in season” mainly from late spring through late summer (with early, mid, and late bloomers covering several months), but as cut flowers they’re effectively available all year.

Information gathered from public forums or data available on the internet and portrayed here.