Nebraska Frost Dates & Growing Season Guide
Nebraska (NE) spans USDA hardiness zones 5a, 5b, with growing seasons ranging from 143 days in Scottsbluff to 180 days in Omaha. The average growing season across the state is approximately 163 days.
Nebraska City Frost Dates
The table below shows the average last spring frost date, first fall frost date, growing season length, and USDA hardiness zone for each city. Click a city name for detailed planting calendars and zone information.
| City | Last Spring Frost | First Fall Frost | Growing Season | Zone | Min Temp |
|---|---|---|---|---|---|
| Omaha | April 15 | October 12 | 180 days | 5b | -15°F |
| Lincoln | April 18 | October 10 | 175 days | 5b | -15°F |
| North Platte | May 3 | October 2 | 152 days | 5a | -20°F |
| Scottsbluff | May 8 | September 28 | 143 days | 5a | -20°F |
Planting Windows for Nebraska
Based on average frost dates, here are the recommended planting windows for each city. The indoor seed start date is approximately seven weeks before the last spring frost. Transplanting should occur about two weeks after the last frost. The last direct sow date for fall crops is ten weeks before the first fall frost.
| City | Start Seeds Indoors | Transplant After | Last Direct Sow |
|---|---|---|---|
| Omaha | February 26 | April 29 | August 3 |
| Lincoln | February 29 | May 2 | August 1 |
| North Platte | March 15 | May 17 | July 24 |
| Scottsbluff | March 20 | May 22 | July 20 |
Gardening in Nebraska
Nebraska's central Great Plains location delivers hot summers, cold winters, and persistent wind that shapes gardening strategy. The eastern half of the state around Omaha and Lincoln in zone 5b has 175 to 180 frost-free days and more rainfall, while western Nebraska in zone 5a is drier and has shorter seasons. Wind protection via fences, buildings, or planted windbreaks is the single most impactful improvement for Nebraska gardens. The state's deep prairie soils are naturally fertile and support excellent vegetable production. Tomatoes, peppers, corn, squash, and beans are summer staples. Fall frost arrives quickly across the plains, so monitoring forecasts in September and having frost covers ready is important.
Understanding Nebraska's Hardiness Zones
Nebraska includes USDA hardiness zones 5a, 5b. These zones indicate the average annual extreme minimum winter temperature for each area, which determines which perennial plants, trees, and shrubs can survive winter without protection. When purchasing trees, shrubs, or perennial flowers, always check that the plant is rated for your hardiness zone or a lower (colder) zone number.
Tips for Using Nebraska Frost Dates
These frost dates represent long-term averages and should be treated as guidelines rather than guarantees. In any given year, the actual last spring frost or first fall frost may arrive one to three weeks earlier or later than the average. Factors that affect your specific location include elevation above the city center, proximity to water, slope direction, and whether you are in an urban or rural area. South-facing slopes and areas near large pavement or building masses tend to be warmer than surrounding open land. Low-lying valleys and exposed hilltops are often colder than mid-slope positions.
To protect against late spring frosts, keep row cover fabric, old bed sheets, or frost blankets on hand. Monitor your local weather forecast daily as the average frost date approaches. When frost is predicted after you have transplanted, covering plants in the late afternoon traps ground heat and can protect against temperatures down to about 28 degrees Fahrenheit. For fall season extension, the same covers protect mature plants from early frosts, often buying several additional weeks of harvest.