60 wildflowers were recorded blooming in California in June in our iNaturalist sample; 12 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in June

Ithuriel's Spear

Western Columbine

Yellow Mariposa Lily
Leichtlin's Mariposa Lily
Milk Thistle

Plummer's Mariposa Lily
Harvest Brodiaea

Clay Mariposa Lily

Ruby Chalice Clarkia

California poppy
Laurel Sumac

Narrowleaf Milkweed
All wildflowers blooming in California in June
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Ithuriel's Spear | Triteleia laxa | agave and allies | 1,508 | May (past peak) |
| 2 | Western Columbine | Aquilegia formosa | buttercup family | 1,464 | Jun (peak) |
| 3 | Yellow Mariposa Lily | Calochortus luteus | lily family | 1,335 | May (past peak) |
| 4 | Leichtlin's Mariposa Lily | Calochortus leichtlinii | lily family | 1,290 | Jul (rising) |
| 5 | Milk Thistle | Silybum marianum | Sunflowers, Daisies, Asters, and Allies | 1,100 | May (past peak) |
| 6 | Plummer's Mariposa Lily | Calochortus plummerae | lily family | 1,090 | Jun (peak) |
| 7 | Harvest Brodiaea | Brodiaea elegans | agave and allies | 972 | May (past peak) |
| 8 | Clay Mariposa Lily | Calochortus argillosus | lily family | 961 | May (past peak) |
| 9 | Ruby Chalice Clarkia | Clarkia rubicunda | evening primrose family | 898 | Jun (peak) |
| 10 | California poppy | Eschscholzia californica | Poppy Family | 857 | Apr (past peak) |
| 11 | Laurel Sumac | Malosma laurina | Cashew Family | 813 | Jul (rising) |
| 12 | Narrowleaf Milkweed | Asclepias fascicularis | Dogbane Family | 776 | Jul (rising) |
| 13 | California Wild Rose | Rosa californica | rose family | 767 | Jun (peak) |
| 14 | Pink Honeysuckle | Lonicera hispidula | honeysuckle family | 754 | Jun (peak) |
| 15 | Chamise | Adenostoma fasciculatum | rose family | 741 | May (past peak) |
| 16 | Butterfly Mariposa Lily | Calochortus venustus | lily family | 731 | May (past peak) |
| 17 | White Globe Lily | Calochortus albus | lily family | 717 | May (past peak) |
| 18 | Orange Bush Monkeyflower | Diplacus aurantiacus | lopseed family | 717 | Apr (past peak) |
| 19 | Tiburon mariposa lily | Calochortus tiburonensis | lily family | 712 | Jun (peak) |
| 20 | Chaparral Yucca | Hesperoyucca whipplei | agave and allies | 705 | May (past peak) |
| 21 | California Buckwheat | Eriogonum fasciculatum | knotweed family | 687 | Jun (peak) |
| 22 | Blue Elder | Sambucus cerulea | elder family | 683 | May (past peak) |
| 23 | Snowplant | Sarcodes sanguinea | heath family | 662 | Jun (peak) |
| 24 | Prettyface | Triteleia ixioides | agave and allies | 657 | May (past peak) |
| 25 | Cobwebby Thistle | Cirsium occidentale | Sunflowers, Daisies, Asters, and Allies | 634 | May (past peak) |
| 26 | Weed's Mariposa Lily | Calochortus weedii | lily family | 598 | Jun (peak) |
| 27 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 541 | Apr (past peak) |
| 28 | Mediterranean Stork's-bill | Erodium botrys | Geranium family | 539 | Apr (past peak) |
| 29 | Redstem Stork's-bill | Erodium cicutarium | Geranium family | 534 | Mar (past peak) |
| 30 | Southern Coastal Bushmallow | Malacothamnus fasciculatus | Mallow and Hibiscus Family | 529 | May (past peak) |
| 31 | Coyote Mint | Monardella villosa | Mint Family | 512 | Jun (peak) |
| 32 | Toyon | Heteromeles arbutifolia | rose family | 507 | Jul (rising) |
| 33 | Golden Yarrow | Eriophyllum confertiflorum | Sunflowers, Daisies, Asters, and Allies | 503 | May (past peak) |
| 34 | California buckeye | Aesculus californica | soapberry family | 501 | May (past peak) |
| 35 | Scarlet Monkeyflower | Erythranthe cardinalis | lopseed family | 481 | Jul (rising) |
| 36 | Seep Monkeyflower | Erythranthe guttata | lopseed family | 477 | May (past peak) |
| 37 | Elegant Clarkia | Clarkia unguiculata | evening primrose family | 466 | May (past peak) |
| 38 | Andrews' Clintonia | Clintonia andrewsiana | lily family | 437 | May (past peak) |
| 39 | Splendid Mariposa Lily | Calochortus splendens | lily family | 417 | May (past peak) |
| 40 | Woollypod Milkweed | Asclepias eriocarpa | Dogbane Family | 411 | Jun (peak) |
| 41 | Sacred Datura | Datura wrightii | nightshade family | 409 | May (past peak) |
| 42 | Deerweed | Acmispon glaber | Legumes | 406 | May (past peak) |
| 43 | Armenian Blackberry | Rubus armeniacus | rose family | 398 | Jun (peak) |
| 44 | California fuchsia | Epilobium canum | evening primrose family | 388 | Oct (rising) |
| 45 | Mediterranean lineseed | Bellardia trixago | broomrape family | 385 | May (past peak) |
| 46 | Woolly Bluecurls | Trichostema lanatum | Mint Family | 372 | May (past peak) |
| 47 | Poison Hemlock | Conium maculatum | carrot family | 367 | May (past peak) |
| 48 | Field Bindweed | Convolvulus arvensis | bindweed family | 361 | May (past peak) |
| 49 | Winecup Clarkia | Clarkia purpurea | evening primrose family | 352 | May (past peak) |
| 50 | White Brodiaea | Triteleia hyacinthina | agave and allies | 351 | May (past peak) |