What to plant in April in Wyoming
In Wyoming (WY), April sits about 5 weeks before the average last frost (May 20). The state averages 118 frost-free days a year (last frost May 20, first frost September 15; USDA zones 3a, 3b, 4a, 4b, 5a, 6a).
70 crops have a sowing or planting window this month, including mache (corn salad), pea, spinach, green onion / scallion, arugula, beet - and 16 of those windows close during April.
Dates here come from Wyoming frost dates (last frost May 20, first frost Sep 15). For one crop in detail, see when to plant pea, spinach or arugula in Wyoming.
Wyoming covers a very wide range of climates, so dates near you can be two weeks or more either side of these. Enter your ZIP code in the planting calendar for dates tuned to your town.
Wyoming: planting activity through the year
Last chance in April
Bell Pepper (start seeds indoors, by Apr 1) · Chili Pepper (start seeds indoors, by Apr 1) · Ginger (start seeds indoors, by Apr 1) · Green Onion / Scallion (start seeds indoors, by Apr 1) · Mint (start seeds indoors, by Apr 1) · Oregano (start seeds indoors, by Apr 1) · Sage (start seeds indoors, by Apr 1) · Tarragon (start seeds indoors, by Apr 1) · Thyme (start seeds indoors, by Apr 1) · Turmeric (start seeds indoors, by Apr 1) · Ground Cherry (start seeds indoors, by Apr 8) · Lemon Balm (start seeds indoors, by Apr 8) · Shiso (Perilla) (start seeds indoors, by Apr 8) · Sweet Marjoram (start seeds indoors, by Apr 8) · Tomatillo (start seeds indoors, by Apr 8) · Tomato (start seeds indoors, by Apr 8)
Sow or plant outdoors in April (45)
Direct sowing and transplanting windows that fall in April, most urgent first. Windows are one-to-two-week bands around the ideal date.
| Crop | What to do | Window | This month |
|---|---|---|---|
| Mache (Corn Salad) | Direct sow (spring) | Apr 10 – Apr 29 | Apr 10 – Apr 29 |
| Pea | Direct sow (spring) | Apr 10 – Apr 29 | Apr 10 – Apr 29 |
| Spinach | Direct sow (spring) | Apr 10 – Apr 29 | Apr 10 – Apr 29 |
| Green Onion / Scallion | Transplant outdoors | Apr 15 – May 2 | Opens Apr 15 |
| Arugula | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Beet | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Fava Bean (Broad Bean) | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Green Onion / Scallion | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Mizuna | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Onion | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Radish | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Shallot | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Tatsoi | Direct sow (spring) | Apr 17 – May 6 | Opens Apr 17 |
| Cabbage | Transplant outdoors | Apr 22 – May 9 | Opens Apr 22 |
| Collard Greens | Transplant outdoors | Apr 22 – May 9 | Opens Apr 22 |
| Horseradish | Plant crowns / divisions | Apr 22 – May 9 | Opens Apr 22 |
| Kale | Transplant outdoors | Apr 22 – May 9 | Opens Apr 22 |
| Kohlrabi | Transplant outdoors | Apr 22 – May 9 | Opens Apr 22 |
| Onion | Transplant outdoors | Apr 22 – May 9 | Opens Apr 22 |
| Rhubarb | Plant crowns / divisions | Apr 22 – May 9 | Opens Apr 22 |
| Shallot | Transplant outdoors | Apr 22 – May 9 | Opens Apr 22 |
| Carrot | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Chervil | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Endive & Escarole | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Kohlrabi | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Lettuce | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Mustard Greens | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Rapini (Broccoli Raab) | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Turnip | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Watercress | Direct sow (spring) | Apr 24 – May 13 | Opens Apr 24 |
| Asparagus | Plant crowns / divisions | Apr 29 – May 16 | Opens Apr 29 |
| Bok Choy / Pak Choi | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Broccoli | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Brussels Sprouts | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Cauliflower | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Chives | Plant crowns / divisions | Apr 29 – May 16 | Opens Apr 29 |
| Endive & Escarole | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Leek | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Lettuce | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Napa Cabbage | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Parsley | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Radicchio | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Sorrel | Plant crowns / divisions | Apr 29 – May 16 | Opens Apr 29 |
| Swiss Chard | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
| Watercress | Transplant outdoors | Apr 29 – May 16 | Opens Apr 29 |
Start seeds indoors in April (47)
Indoor sowings for transplants later. Six to eight weeks under lights is typical for tomatoes and peppers; onions and leeks need longer.
| Crop | What to do | Window | This month |
|---|---|---|---|
| Bell Pepper | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Chili Pepper | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Ginger | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Green Onion / Scallion | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Mint | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Oregano | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Sage | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Tarragon | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Thyme | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Turmeric | Start seeds indoors | Mar 18 – Apr 1 | Last chance - ends Apr 1 |
| Ground Cherry | Start seeds indoors | Mar 25 – Apr 8 | Last chance - ends Apr 8 |
| Lemon Balm | Start seeds indoors | Mar 25 – Apr 8 | Last chance - ends Apr 8 |
| Shiso (Perilla) | Start seeds indoors | Mar 25 – Apr 8 | Last chance - ends Apr 8 |
| Sweet Marjoram | Start seeds indoors | Mar 25 – Apr 8 | Last chance - ends Apr 8 |
| Tomatillo | Start seeds indoors | Mar 25 – Apr 8 | Last chance - ends Apr 8 |
| Tomato | Start seeds indoors | Mar 25 – Apr 8 | Last chance - ends Apr 8 |
| Broccoli | Start seeds indoors | Apr 1 – Apr 15 | Apr 1 – Apr 15 |
| Brussels Sprouts | Start seeds indoors | Apr 1 – Apr 15 | Apr 1 – Apr 15 |
| Cabbage | Start seeds indoors | Apr 1 – Apr 15 | Apr 1 – Apr 15 |
| Cauliflower | Start seeds indoors | Apr 1 – Apr 15 | Apr 1 – Apr 15 |
| Kale | Start seeds indoors | Apr 1 – Apr 15 | Apr 1 – Apr 15 |
| Basil | Start seeds indoors | Apr 8 – Apr 22 | Apr 8 – Apr 22 |
| Collard Greens | Start seeds indoors | Apr 8 – Apr 22 | Apr 8 – Apr 22 |
| Endive & Escarole | Start seeds indoors | Apr 8 – Apr 22 | Apr 8 – Apr 22 |
| Kohlrabi | Start seeds indoors | Apr 8 – Apr 22 | Apr 8 – Apr 22 |
| Malabar Spinach | Start seeds indoors | Apr 8 – Apr 22 | Apr 8 – Apr 22 |
| Okra | Start seeds indoors | Apr 8 – Apr 22 | Apr 8 – Apr 22 |
| Radicchio | Start seeds indoors | Apr 8 – Apr 22 | Apr 8 – Apr 22 |
| Summer Savory | Start seeds indoors | Apr 8 – Apr 22 | Apr 8 – Apr 22 |
| Bitter Melon | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Bok Choy / Pak Choi | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Cucamelon | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Fennel (Bulb) | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Lettuce | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Luffa (Loofah Gourd) | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Napa Cabbage | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| New Zealand Spinach | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Peanut | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Swiss Chard | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Watercress | Start seeds indoors | Apr 15 – Apr 29 | Apr 15 – Apr 29 |
| Cantaloupe / Muskmelon | Start seeds indoors | Apr 22 – May 6 | Opens Apr 22 |
| Cucumber | Start seeds indoors | Apr 22 – May 6 | Opens Apr 22 |
| Pumpkin | Start seeds indoors | Apr 22 – May 6 | Opens Apr 22 |
| Sunflower | Start seeds indoors | Apr 22 – May 6 | Opens Apr 22 |
| Watermelon | Start seeds indoors | Apr 22 – May 6 | Opens Apr 22 |
| Winter Squash | Start seeds indoors | Apr 22 – May 6 | Opens Apr 22 |
| Zucchini / Summer Squash | Start seeds indoors | Apr 22 – May 6 | Opens Apr 22 |
Planting dates for popular crops in Wyoming
Every crop has its own full-year dates for Wyoming: indoor start, transplant or direct sowing, and harvest.
Seed-starting season: April garden jobs in Wyoming
- Start 47 crops indoors this month, including bell pepper, chili pepper, ginger, green onion / scallion. Use a sterile mix and good light - see starting seeds indoors.
- 5 weeks until the average last frost (May 20). The seed-starting calculator works out each crop's exact sowing date from it.
- Keep seedlings from stretching: lights 2-3 inches above the leaves for 14-16 hours a day, and a fan or a daily brush of the hand across the tops.
- Prepare beds as soon as the soil crumbles instead of smearing when squeezed - working wet soil ruins its structure for the season.
USDA zone chart for Wyoming
Wyoming spans USDA zones 3a, 3b, 4a, 4b, 5a, 6a. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average.
Questions gardeners ask
What vegetables can I plant in Wyoming in April?
70 crops have a window in April: mache (corn salad), pea, spinach, green onion / scallion, arugula, beet, fava bean (broad bean), mizuna, onion, radish and more. The tables above give the exact dates for each.
Is it too late to plant tomatoes in Wyoming in April?
No - start seeds indoors runs Mar 25 – Apr 8 in Wyoming, so do it before April 8.
Is it too late to plant lettuce in Wyoming in April?
No - start seeds indoors runs Apr 15 – Apr 29 in Wyoming, so do it before April 29.
When is the first frost in Wyoming?
The statewide average first fall frost is around September 15 and the last spring frost around May 20. Wyoming covers a wide range of climates, so local dates can differ by two weeks or more - look yours up by ZIP code.
What should I start indoors in April in Wyoming?
Bell Pepper (Mar 18 – Apr 1), Chili Pepper (Mar 18 – Apr 1), Ginger (Mar 18 – Apr 1), Green Onion / Scallion (Mar 18 – Apr 1), Mint (Mar 18 – Apr 1), Oregano (Mar 18 – Apr 1), Sage (Mar 18 – Apr 1), Tarragon (Mar 18 – Apr 1), Thyme (Mar 18 – Apr 1), Turmeric (Mar 18 – Apr 1), Ground Cherry (Mar 25 – Apr 8), Lemon Balm (Mar 25 – Apr 8), Shiso (Perilla) (Mar 25 – Apr 8), Sweet Marjoram (Mar 25 – Apr 8), Tomatillo (Mar 25 – Apr 8), Tomato (Mar 25 – Apr 8), Broccoli (Apr 1 – Apr 15), Brussels Sprouts (Apr 1 – Apr 15), Cabbage (Apr 1 – Apr 15), Cauliflower (Apr 1 – Apr 15), Kale (Apr 1 – Apr 15), Basil (Apr 8 – Apr 22), Collard Greens (Apr 8 – Apr 22), Endive & Escarole (Apr 8 – Apr 22), Kohlrabi (Apr 8 – Apr 22), Malabar Spinach (Apr 8 – Apr 22), Okra (Apr 8 – Apr 22), Radicchio (Apr 8 – Apr 22), Summer Savory (Apr 8 – Apr 22), Bitter Melon (Apr 15 – Apr 29), Bok Choy / Pak Choi (Apr 15 – Apr 29), Cucamelon (Apr 15 – Apr 29), Fennel (Bulb) (Apr 15 – Apr 29), Lettuce (Apr 15 – Apr 29), Luffa (Loofah Gourd) (Apr 15 – Apr 29), Napa Cabbage (Apr 15 – Apr 29), New Zealand Spinach (Apr 15 – Apr 29), Peanut (Apr 15 – Apr 29), Swiss Chard (Apr 15 – Apr 29), Watercress (Apr 15 – Apr 29), Cantaloupe / Muskmelon (Apr 22 – May 6), Cucumber (Apr 22 – May 6), Pumpkin (Apr 22 – May 6), Sunflower (Apr 22 – May 6), Watermelon (Apr 22 – May 6), Winter Squash (Apr 22 – May 6), Zucchini / Summer Squash (Apr 22 – May 6).
What to plant in April in other states
Dates are computed from Wyoming’s statewide average frost dates (from NOAA/NCEI climate normals) and each crop’s timing in our crop database. Your garden may be a week or two either side - for dates tuned to your ZIP code, use the planting calendar.