If you live in Utah and want a spring garden that actually blooms before June, you need to plant the right annuals at the right time. The four flowers — pansies, ranunculus, English daisies, and Johnny Jump Ups — are your best bet for early color. But each one has a different cold tolerance, and planting them on the same weekend is a mistake.
Here is the exact timing for each flower, based on Utah’s frost zones and soil temperature data from the Utah Climate Center. I’ve included the specific mistakes I see gardeners make every March, and the one flower you should absolutely not plant until April.
Why Utah’s Spring Is Different From Everywhere Else
Utah’s spring is not a gentle transition. It’s a roller coaster. You get 70°F afternoons in March, then a hard freeze that kills everything you planted in optimism. The Wasatch Front sits in USDA zones 5b to 7a. St. George is zone 8a. Park City is zone 4b. That’s a 4-zone spread within a three-hour drive.
Here is the one number you need to memorize: 32°F. That’s the temperature that kills the flowers of pansies and Johnny Jump Ups. Ranunculus leaves survive 25°F, but the buds die at 28°F. English daisies are tougher — they shrug off 20°F.
The average last frost date in Salt Lake City is April 30. In Provo, May 5. In St. George, March 25. But those are averages. I’ve seen frost on May 15 in Sandy. So planting by the calendar alone is a gamble.
Instead, use soil temperature. These four flowers all need soil above 45°F to grow roots. But their above-ground parts have different tolerances. That’s the key to timing them correctly.
Soil Temperature: The Only Reliable Metric
Buy a $10 soil thermometer from IFA Country Stores or Amazon. Stick it 4 inches into the ground at 9 AM. If it reads 45°F or higher for three consecutive mornings, you can plant. That usually happens in mid-March in Utah Valley, early April in Salt Lake, and late April in the mountain valleys.
Pansies: The Safest Bet, But Only If You Wait
Pansies are the most popular early spring annual in Utah, and for good reason. They survive light frosts, they bloom in cool weather, and they come in every color except true blue. But I see people plant them in February, thinking “pansies like cold.” That’s wrong.
Pansies stop growing when soil drops below 40°F. If you plant them in February, they sit there, wet, rotting, and attracting slugs. You gain nothing. The plants that go in the ground in late March catch up to the February-planted ones within two weeks.
Plant pansies when soil is 45°F and nighttime lows stay above 28°F. In Salt Lake City, that’s usually March 20 to April 5. In St. George, March 1. In Park City, April 20.
Pansy Variety Matters
The ‘Matrix’ series from PanAmerican Seed handles Utah’s temperature swings better than the ‘Majestic Giant’ series. Matrix plants stay compact and keep blooming through May heat. Majestic Giants get leggy and stop flowering when daytime temps hit 75°F. At IFA, a 6-pack of Matrix pansies costs $4.99. At Home Depot, the same size in Majestic Giant is $3.49. The extra $1.50 is worth it.
Ranunculus: The One You Must Not Rush
Ranunculus are the showstoppers of the spring garden. The double-flowered varieties look like peonies on steroids. But they are the least cold-tolerant of these four flowers. And they are the most expensive, at $8 to $12 for a 6-inch pot at local nurseries like Millcreek Gardens or Cactus & Tropicals.
Here is the hard truth: do not plant ranunculus until nighttime lows are consistently above 32°F. That means April 15 in Salt Lake City. April 25 in Provo. March 15 in St. George.
I planted ranunculus on April 1 in 2026, after a warm March. Then April 8 brought a 27°F freeze. Every bud turned to mush. The leaves survived, but the flowers were gone. I got nothing until late May from plants that should have bloomed in mid-April.
Pre-Sprouting Corms: The Workaround
If you want ranunculus flowers in April, start the corms indoors in February. Soak them for 3-4 hours, then plant them in 4-inch pots filled with Miracle-Gro Seed Starting Mix ($7.98 at Lowe’s). Keep them at 50°F under grow lights. Transplant them outside after your last frost date. This gives you a 4-week head start.
But don’t bother if you live above 5,000 feet. Ranunculus struggle with the intense UV and thin air in Park City or Heber Valley. Stick with pansies up there.
English Daisies: The Toughest of the Bunch
English daisies (Bellis perennis) are the workhorses of early spring. They bloom at 40°F. They survive snow. They keep flowering through rain, hail, and the weird April sleet storms that Utah specializes in. If you want something that absolutely will not fail, plant English daisies.
They are perennials in zones 4-7, but Utah’s summer heat kills them by July. So treat them as annuals. Plant them as early as March 1 in Salt Lake City. I’ve planted them on February 20 in a mild year and they were fine.
English daisies come in two main types: the common ‘Bellis’ series with small, single flowers, and the ‘Pomponette’ series with double, button-like blooms. The Pomponette series costs $5.99 for a 4-inch pot at Red Butte Garden’s spring sale. They look better, but they don’t spread as fast. If you want ground cover, buy the common Bellis.
The One Problem With English Daisies
They get powdery mildew when the weather turns hot and humid in June. Plant them in full sun and give them space — 8 inches apart minimum. If you crowd them, the mildew shows up by Memorial Day. Space them 10 inches apart and you get clean foliage until July.
Johnny Jump Ups: The Self-Sowing Surprise
Johnny Jump Ups (Viola tricolor) are the cheapest and easiest of these four. A seed packet costs $2.49 at Western Garden Centers. And once you plant them, they come back every year from dropped seed. They are essentially a perennial in Utah, even though they are sold as annuals.
They are also the most cold-tolerant. Johnny Jump Ups survive 20°F without damage. The flowers keep blooming through light freezes. You can plant them in mid-March in Salt Lake City, late February in St. George, and early April in the mountain valleys.
But here is the catch: they stop blooming in hot weather. When daytime temps hit 80°F, they go dormant. In Utah, that’s usually mid-June. So you get about 10 weeks of flowers. That’s fine if you plan to replace them with summer annuals like zinnias or marigolds. But if you want continuous color through August, skip Johnny Jump Ups and plant pansies instead.
How to Get the Most Blooms
Deadhead every three days. Johnny Jump Ups that go to seed stop producing flowers. Snip off the spent blooms at the stem. Do this and you get 50% more flowers over the season. Skip it and you get a few weeks of color followed by a patch of seed pods.
Planting Calendar for Utah (By Region)
Here is the cheat sheet. Print it or bookmark it.
| Flower | Salt Lake City (Zone 6b) | Provo (Zone 6a) | St. George (Zone 8a) | Park City (Zone 4b) |
|---|---|---|---|---|
| Pansies | March 20 – April 5 | March 25 – April 10 | March 1 – March 15 | April 20 – May 5 |
| Ranunculus | April 15 – May 1 | April 20 – May 5 | March 15 – April 1 | Do not plant |
| English Daisies | March 1 – April 1 | March 5 – April 5 | February 15 – March 1 | April 15 – May 15 |
| Johnny Jump Ups | March 15 – April 1 | March 20 – April 5 | February 20 – March 5 | April 10 – April 25 |
These dates assume average soil temperatures of 45°F. If your soil is still frozen or waterlogged, wait. Wet soil kills pansies and ranunculus faster than cold air does.
Three Mistakes That Kill Spring Annuals in Utah
I’ve made all three of these. Here is what to avoid.
Mistake 1: Planting Into Cold, Wet Soil
Utah’s clay soil holds water in March. If you dig a hole and water pools in it, do not plant. Wait a week. Pansies and Johnny Jump Ups rot in wet soil below 45°F. Add 2 inches of compost (Steiner’s Organics sells a good one for $6.99 per bag) to improve drainage before you plant anything.
Mistake 2: Fertilizing Too Early
Do not fertilize until the plants have been in the ground for three weeks and are actively growing. Applying 10-10-10 fertilizer in March, when soil is cold, burns the roots. Use a half-strength liquid fertilizer like Alaska Fish Fertilizer 5-1-1 ($12.99 at IFA) after the plants show new growth.
Mistake 3: Ignoring the Wind
Utah’s spring wind is brutal. A 40 mph gust in April can snap ranunculus stems and desiccate pansy leaves. Plant in a sheltered spot or use a windbreak. I use 18-inch tall tomato cages cut in half and wrapped with row cover fabric. That costs about $3 per plant to protect, but it saves the flowers.
Which Flower Should You Pick? A Quick Comparison
Here is the bottom line for each situation.
- For the earliest color (March): English daisies. They bloom at 40°F and survive snow. Plant them first.
- For the longest bloom season (March through June): Pansies, specifically the ‘Matrix’ series. They handle Utah’s temperature swings and keep blooming until June heat kills them.
- For the biggest, showiest flowers: Ranunculus. But wait until mid-April in Salt Lake City. Do not rush them.
- For the cheapest option that returns every year: Johnny Jump Ups from seed. $2.49 for years of flowers.
- For high elevations (above 5,000 feet): English daisies and Johnny Jump Ups. Skip ranunculus entirely.
Plant by soil temperature, not by the calendar. Buy a $10 thermometer. Check it for three mornings. Then plant. That single habit will save you more money and heartbreak than any other piece of advice .
