When to Plant Wildflower Seeds: Fall Dates by Region and City

Sow wildflower seed in fall. Where winters are cold, and across the Southeast, the seed goes down from the first hard freeze onward and lies dormant until spring, while winter's cold and damp break the dormancy that keeps many native perennials from sprouting. In Texas, California and Florida it goes down earlier, into still-warm soil, so many annuals sprout with the fall rains and grow through the cool months before flowering in spring.

Timing only pays off on clean ground. Weed competition, not the sowing date, is the main reason new meadows fail, so the work starts a season before the seed bag is opened. The sections below give the dates for your area, then the preparation, sowing method and first three years that turn a fall sowing into a meadow.

Wildflower seed planting dates by city

Each row gives one city's fall sowing window and what sets it. In Zone 7 and colder, and in the Southeast, the window runs from the median first hard freeze, which lands later than the first light frost shown beside it, to five weeks after. Texas and West Coast cities follow a fall calendar or the fall rains instead of a frost date.

Frost dates are medians from NOAA 1991–2020 climate normals for each city's main weather station; Texas and West Coast rows give regional sowing months instead.

For a town not listed in Zone 7 or colder, or in the Southeast east of Texas, look up the median first hard freeze for your nearest weather station and sow from that date to 35 days after. In Texas, sow from September to early November in the north and through November near the Gulf; on the West Coast, use the regional windows further down.

Reading the table for your area

Boston's window falls about a month later than the mid- to late-October target used inland in New Hampshire. Away from the coast, lean toward the early end of your window, because November weather in northern New England is unpredictable and snow can arrive before the seed is down.

Raleigh and Atlanta follow the cold-winter rule because fall sowing in the Southeast is dormant seeding too, and sowing there can run on into February. In western Oregon, sowing from late September through early November is standard, and the later part of that span loses less seed to birds and rodents.

Why fall sowing beats spring for most wildflowers

Fall sowing gives seed the cold, damp winter that many native perennials need before they will germinate, a process called cold stratification. Outdoors, the job costs nothing: rain, snow and freezing nights soften the seed's dormancy and settle the seed into the soil surface by spring.

The timing differs by region because the seed does different things in different climates. In cold-winter zones and the Southeast, fall-sown seed is meant to sit dormant until spring; that is why the window opens only once the ground is cold enough to keep it from sprouting. In warm climates, many annual wildflowers germinate in fall, grow slowly through winter and flower in spring. Fall sowing in Texas, for example, is what lets Texas bluebonnet and other early bloomers flower from late winter into spring, and California sowings follow the same pattern of fall germination, winter growth and spring bloom. Western Oregon is different: seed broadcast there in early November is timed to sprout in spring.

Spring sowing is possible, but it tends to favor grasses over the wildflowers you want to dominate. It suits annual mixes in cold climates. Spring-sown perennials often do not flower until their second growing season.

Fall sowing windows by region

Fall is the preferred season in nearly every US region; only the start and end dates shift.

Windows are for native wildflower mixes sown outdoors where they will grow; local weather in a given year can move the best date within them.

Cold-winter states

From the Northern Plains to New England, fall sowing is dormant seeding: the aim is cold, not growth, so the seed should still be lying dormant when the ground freezes. Grass-heavy prairie mixes are the exception, covered further down.

The South, Gulf Coast and Florida

In the Southeast, the soil sets the date more reliably than the calendar, using the temperature check in the next section. Texas runs on the calendar instead, starting in September and finishing earlier the farther north you are. In Florida and the frost-free Zones 10 and 11, rain and soil warmth decide. Germination falls off when the soil is colder than the mid-60s °F (about 18°C) or warmer than the mid-90s °F (about 35°C), so avoid the hot months entirely.

The West

California and Pacific Northwest sowings ride the return of fall and winter rain. In the Arizona low desert, sow early in November, ahead of the winter rains. Rain rather than frost decides the result there: a wet October followed by rain from December through February brings a strong spring bloom, while a wet summer can fill the ground with summer annuals that hold back winter wildflowers.

How to tell the ground is ready

Sow once the vegetation on the site is dead and cleared and the soil is cold enough, or the season wet enough, for the seed to behave as intended.

In cold-winter areas and the Southeast, soil temperature works as a ceiling rather than a minimum. Check it over several days, not one cold morning. Sow once it stays below 50°F (10°C), or once it starts dropping below 40°F (4°C), so seed does not sprout in a warm fall spell. The first hard freeze is a dependable stand-in if you do not own a soil thermometer, which is why the city table counts from it. In Texas, California and Florida the logic runs the other way: seed goes into still-warm soil so it can sprout with the fall rains, and readiness means steady fall rain or, failing that, a hose that can keep the surface damp for several weeks.

Prepare the site a season ahead

Clear the existing vegetation before you sow; weed competition for light, water and nutrients is the biggest obstacle to a wildflower stand, and seed scattered onto lawn or weeds loses to them. Weedy ground can take one to two years of preparation, so start in spring or summer for a fall sowing.

Smothering and solarizing need the summer sun, so they set the earliest date a fall sowing can follow.

Skip deep tilling. Turning the soil lifts buried weed seed into the light, where it sprouts alongside your wildflowers; if compacted ground needs loosening, work no deeper than 2 to 4 inches (5–10 cm). Skip manure and nitrogen fertilizer too, since wildflowers prefer lean soil and extra fertility feeds leaves and weeds at the expense of flowers. On heavy clay or very poor soil, a thin layer of weed-free compost spread on the surface before seeding is fine.

Pick an open spot in full sun with good drainage, since most meadow wildflowers need full sun. About 400 square feet (37 m²) is a sensible minimum for a true meadow. Buy native seed suited to your state or region, ideally a local ecotype bought species by species, because some non-native mixes include plants that spread and crowd out natives. If a strip of lawn stays beside the meadow, when to plant grass seed covers repairing its edges.

How to sow wildflower seed

Sow onto bare, smooth, firm soil, and aim for contact with the soil rather than burial. The rate depends mostly on seed size, so the label on your mix outranks any general figure.

Small, dusty seed covers far more ground per ounce than large seed, which is why rates span a wide range.

1. Rake the cleared ground smooth. Remove dead vegetation, plastic and debris, and scratch only the top crust so seed meets bare soil without disturbing buried weed seed.
2. Weigh out seed for the area. Measure the plot and weigh the label rate; for most mixes that is 4 to 8 ounces per 1,000 square feet (1.2–2.4 g per m²).
3. Bulk the seed with damp sand. Mix it with at least an equal volume of slightly damp sand or vermiculite so tiny seed spreads evenly. For a meadow mix, about 0.5 to 1 gallon (1.9–3.8 L) of carrier covers 500 square feet (46 m²).
4. Broadcast in two passes at right angles. Spread half the mix walking one way and the rest crosswise, which fills thin strips a single pass can leave.
5. Press the seed in without burying it. Roll with a lawn roller or cultipacker, tamp, or walk the area. If you rake, go no deeper than about 1/4 inch (6 mm). Most wildflower seed needs light to sprout, and seed buried 1/2 inch (13 mm) or deeper can germinate and still fail to reach the surface.
6. Mulch only where seed could wash or blow. On slopes or windy sites, use about one bale of clean straw per 1,000 square feet (93 m²), thin enough that soil still shows through.
7. Water to suit the season. Where seed sprouts in fall (Texas, California, Florida) or after a spring sowing, keep the top 1/2 inch (13 mm) damp until seedlings appear and keep them moist for four to six weeks; in Texas, a brief watering every three days for about three weeks does the job. After a dormant fall sowing, skip routine watering and let rain and snow settle the seed. Established native meadows need no routine watering.

Seeds and mixes that change the timing

Annuals and perennials follow the same calendar but reward it differently. Annual wildflowers bloom the first season from either a fall or spring sowing, which makes them the safer choice for a late start; see annual flowers for more on how they differ. Perennials such as purple coneflower gain the most from fall sowing, because many will not germinate until they have been chilled.

Some seed needs treatment before a spring sowing. Milkweeds such as butterfly weed, columbines and penstemons need 2 to 4 weeks of cold, moist stratification, and many other perennial species need 60 to 90 days at 32–50°F (0–10°C). Chill that seed in the refrigerator before spring sowing, or skip the step by sowing in fall. If monarchs are the goal, milkweed for monarchs covers which species to grow.

Hard-coated seed is the other exception. Texas bluebonnet seed sown untreated may give only one or two plants from 50 seeds, while nicking or sanding the coat (scarification) can raise that to nearly all of them. Scarified seed sprouts fast, though, which leaves the young plants more exposed to a spell of extreme weather.

Grass-heavy tallgrass prairie mixes run on a different calendar from wildflower meadows. They are sown from late May to June 15 in the Upper Midwest, in May elsewhere in the Midwest and from late February to March on the Southern Plains. Late fall and early spring sowings also work, because they give the seed natural chilling. Those mixes are at least 60% grass, seeded at 11 to 13 pure live seeds per square foot (120–140 per m²).

If you sow too early, too late or into a late frost

Too early is the costly error, and too late is easy to recover from.

Too early in fall. If seedlings come up before winter in a cold zone, expect losses, then reseed thin patches late in fall or frost-seed them in January or February.

Too late in fall. If the ground has frozen in a cold-winter state, scatter the seed onto frozen ground or a thin snow cover in January or February and let winter moisture settle it in. Otherwise, hold it and sow as early in spring as the ground can be worked. Store unsown seed cold and dry; the refrigerator at 35–40°F (2–4°C) is ideal. A useful rule for any storage spot is that the temperature in °F plus the relative humidity in percent should stay below 100, or the seed loses viability quickly. In Texas, seed kept cool and dry over summer can be sown the following late August or early September. California sowings can continue from December to mid-February, though earlier sowing fits the natural cycle better.

Into a spring frost. Fall-sown seed is meant to sit through frost, snow and freezing nights, so a cold snap after a fall sowing does no harm. Spring-sown annuals are the ones at risk: sow annual mixes after the danger of frost has passed. Central Oregon is the exception, where spring seed goes down about a month before the last hard frost, typically in early May. Spring dates elsewhere in Oregon run from late March in the south to mid-April in the west and mid- to late May in the east.

What to expect in years one to three

A new perennial meadow looks sparse for two seasons and comes into its own in the third.

Perennials spend their first year building roots, so a meadow is judged in year three, not year one.

Year one. Mow whenever growth reaches about 12 inches (30 cm), with the blade set above the wildflower seedlings, to stop annual weeds from setting seed. Avoid pulling weeds while young wildflower roots are still developing; mowing does the job with less disturbance.

Year two. Expect the planting to look disappointing: wildflower seedlings and weeds are hard to tell apart, and only some biennials and perennials bloom. Black-eyed Susan is often the first to flower. A mid-summer mow at 4 to 6 inches (10–15 cm) keeps weeds from going to seed.

Year three. Most natives flower regularly. Coreopsis and columbines may bloom by late June, followed in midsummer by wild bergamot, oxeye sunflower, purple coneflower and yellow coneflower. Goldenrods carry the bloom into fall for bees. For more long-lived choices, see perennial flowers.

Every year after. Mow or burn only a quarter to a third of the meadow each year. Cut at 6 to 8 inches (15–20 cm) or higher in November, or leave the stems standing until early spring, and never mow until at least half of the late bloomers have dropped their seed. Burning takes expertise, may need a permit and should wait until year three or four. Some species will fade and others spread; reseed thin patches in fall. To plan where a meadow fits among the beds, paths and lawn you already have, map it in Sow's garden planner.