60 wildflowers were recorded blooming in California in April in our iNaturalist sample; 27 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top wildflowers in April
Rose Clover
Redstem Stork's-bill

Tomcat Clover
Mediterranean Stork's-bill

Blue Dicks

Ithuriel's Spear

California poppy

Checkerbloom
Western Blue-Eyed Grass
Musk Stork's-Bill

White Globe Lily

White Clover
All wildflowers blooming in California in April
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Rose Clover | Trifolium hirtum | Legumes | 4,010 | Apr (peak) |
| 2 | Redstem Stork's-bill | Erodium cicutarium | Geranium family | 3,639 | Mar (past peak) |
| 3 | Tomcat Clover | Trifolium willdenovii | Legumes | 3,451 | Apr (peak) |
| 4 | Mediterranean Stork's-bill | Erodium botrys | Geranium family | 3,288 | Apr (peak) |
| 5 | Blue Dicks | Dipterostemon capitatus | agave and allies | 3,104 | Apr (peak) |
| 6 | Ithuriel's Spear | Triteleia laxa | agave and allies | 2,739 | May (rising) |
| 7 | California poppy | Eschscholzia californica | Poppy Family | 2,598 | Apr (peak) |
| 8 | Checkerbloom | Sidalcea malviflora | Mallow and Hibiscus Family | 2,124 | Apr (peak) |
| 9 | Western Blue-Eyed Grass | Sisyrinchium bellum | iris family | 2,100 | Apr (peak) |
| 10 | Musk Stork's-Bill | Erodium moschatum | Geranium family | 2,059 | Apr (peak) |
| 11 | White Globe Lily | Calochortus albus | lily family | 2,015 | May (rising) |
| 12 | White Clover | Trifolium repens | Legumes | 1,899 | Apr (peak) |
| 13 | Distant Phacelia | Phacelia distans | borage family | 1,781 | Mar (past peak) |
| 14 | Cut-leaved crane's-bill | Geranium dissectum | Geranium family | 1,679 | Apr (peak) |
| 15 | Scarlet Pimpernel | Lysimachia arvensis | primrose family | 1,617 | Apr (peak) |
| 16 | Tidy Tips | Layia platyglossa | Sunflowers, Daisies, Asters, and Allies | 1,586 | Apr (peak) |
| 17 | Chaparral Yucca | Hesperoyucca whipplei | agave and allies | 1,504 | May (rising) |
| 18 | Checker Lily | Fritillaria affinis | lily family | 1,460 | Mar (past peak) |
| 19 | Chia | Salvia columbariae | Mint Family | 1,449 | Mar (past peak) |
| 20 | Cretan mallow | Malva multiflora | Mallow and Hibiscus Family | 1,326 | Apr (peak) |
| 21 | Trailing Blackberry | Rubus ursinus | rose family | 1,249 | Apr (peak) |
| 22 | Blue Elder | Sambucus cerulea | elder family | 1,224 | May (rising) |
| 23 | Orange Bush Monkeyflower | Diplacus aurantiacus | lopseed family | 1,202 | Apr (peak) |
| 24 | Dove's-foot crane's-bill | Geranium molle | Geranium family | 1,193 | Apr (peak) |
| 25 | White-Tipped Clover | Trifolium variegatum | Legumes | 1,170 | Apr (peak) |
| 26 | Milk Thistle | Silybum marianum | Sunflowers, Daisies, Asters, and Allies | 1,104 | May (rising) |
| 27 | Little-Robin | Geranium purpureum | Geranium family | 1,045 | Apr (peak) |
| 28 | Desert Dandelion | Malacothrix glabrata | Sunflowers, Daisies, Asters, and Allies | 1,025 | Mar (past peak) |
| 29 | Menzies' baby blue eyes | Nemophila menziesii | borage family | 998 | Mar (past peak) |
| 30 | Common Yarrow | Achillea millefolium | Sunflowers, Daisies, Asters, and Allies | 939 | Apr (peak) |
| 31 | California Golden Violet | Viola pedunculata | Violet Family | 919 | Mar (past peak) |
| 32 | Pacific hound's tongue | Adelinia grandis | borage family | 914 | Mar (past peak) |
| 33 | Creamcups | Platystemon californicus | Poppy Family | 898 | Apr (peak) |
| 34 | Subterranean Clover | Trifolium subterraneum | Legumes | 898 | Apr (peak) |
| 35 | California Barrel Cactus | Ferocactus cylindraceus | cacti | 897 | Mar (past peak) |
| 36 | Pacific trillium | Trillium ovatum | Herb-Paris, False Hellebores, Trilliums and allies | 895 | Mar (past peak) |
| 37 | Diogenes' lantern | Calochortus amabilis | lily family | 893 | May (rising) |
| 38 | Purple Owl's-Clover | Castilleja exserta | broomrape family | 873 | Apr (peak) |
| 39 | Cheeseweed Mallow | Malva parviflora | Mallow and Hibiscus Family | 836 | Apr (peak) |
| 40 | Tolmie's pussy ears | Calochortus tolmiei | lily family | 815 | May (rising) |
| 41 | Western Columbine | Aquilegia formosa | buttercup family | 799 | Jun (rising) |
| 42 | Miniature Lupine | Lupinus bicolor | Legumes | 795 | Apr (peak) |
| 43 | Ookow | Dichelostemma congestum | agave and allies | 774 | May (rising) |
| 44 | Creosote Bush | Larrea tridentata | caltrops | 772 | Mar (past peak) |
| 45 | Lawn daisy | Bellis perennis | Sunflowers, Daisies, Asters, and Allies | 743 | Apr (peak) |
| 46 | Tree Clover | Trifolium ciliolatum | Legumes | 743 | Apr (peak) |
| 47 | Redmaids | Calandrinia menziesii | Pussypaw Family | 742 | Mar (past peak) |
| 48 | California buttercup | Ranunculus californicus | buttercup family | 736 | Mar (past peak) |
| 49 | Brittlebush | Encelia farinosa | Sunflowers, Daisies, Asters, and Allies | 728 | Mar (past peak) |
| 50 | Wallace's woollydaisy | Eriophyllum wallacei | Sunflowers, Daisies, Asters, and Allies | 669 | Apr (peak) |