Somerset, KY planting calendar
- USDA zone
- 7a0 to 5 °F
- Last frost
- Apr 5avg, 32°F
- First frost
- Oct 30avg, 32°F
- Growing season
- 206days
Somerset, Kentucky is in USDA plant hardiness zone 7a. Its average last spring frost is around April 5 and the first fall frost around October 30, giving a growing season of about 206 days (NOAA 1991–2020 normals, 32°F, median). Start tender crops like tomatoes and peppers indoors weeks before the last frost and set them out afterward; sow hardy crops such as peas, spinach, and lettuce before it. The planner below turns those frost dates into a printable per-crop planting calendar.
Somerset planting calendar
Each crop's windows are counted from Somerset's average frost dates. hatched = start seeds indoors, solid green = plant out, teal = a fall sowing, and the terracotta dot marks the estimated first harvest. Ranges are extension-guide planning guidance, not guarantees.
- Start indoors
- Plant out
- Fall sowing
- First harvest
| Crop | Frost tolerance | Start indoors | Plant out | First harvest | Fall planting |
|---|---|---|---|---|---|
| Tomato | Tender | Feb 8 – Feb 22 | Apr 12 – Apr 19 | Jun 11 – Jul 1 | — |
| Pepper | Very tender | Jan 25 – Feb 8 | Apr 19 – Apr 26 | Jun 18 – Jul 18 | — |
| Cucumber | Tender | Mar 8 – Mar 15 | Apr 12 – Apr 19 | Jun 1 – Jun 21 | — |
| Summer squash / zucchini | Tender | — | Apr 12 – Apr 19 | May 27 – Jun 11 | — |
| Bush bean | Tender | — | Apr 12 – Apr 19 | Jun 1 – Jun 11 | Aug 31 – Sep 10 |
| Sweet corn | Tender | — | Apr 5 – Apr 19 | Jun 4 – Jul 4 | — |
| Basil | Very tender | Feb 22 – Mar 8 | Apr 12 – Apr 19 | May 12 – May 27 | — |
| Lettuce | Half-hardy | Feb 22 – Mar 8 | Mar 8 – Mar 22 | Apr 22 – May 7 | Aug 17 – Sep 1 |
| Pea | Hardy | — | Feb 22 – Mar 8 | Apr 18 – May 3 | Aug 7 – Aug 22 |
| Spinach | Hardy | — | Feb 22 – Mar 8 | Apr 3 – Apr 13 | Aug 27 – Sep 6 |
| Carrot | Half-hardy | — | Mar 15 – Mar 22 | May 14 – Jun 3 | Jul 28 – Aug 17 |
| Broccoli | Half-hardy | Feb 8 – Feb 22 | Mar 8 – Mar 22 | May 2 – May 22 | Aug 2 – Aug 22 |
Data: NOAA NCEI U.S. Climate Normals 1991–2020 (public domain) and USDA Plant Hardiness Zone Map 2023. Planting windows synthesized from U.S. Cooperative Extension guides.
Frost & freeze dates
From NOAA's 1991–2020 Climate Normals at station USC00157510. The median (p50) is the average date; the 90%-safe column is the date the freeze has passed in about 9 years out of 10 (p10 for spring, p90 for fall) — the conservative date to plant after or harvest before.
| Threshold | Last spring — avg | Last spring — 90%-safe | First fall — avg | First fall — 90%-safe | Season (days) |
|---|---|---|---|---|---|
| 36°F | Apr 19 | May 7 | Oct 20 | Nov 1 | 184 |
| 32°F (freeze) | Apr 5 | Apr 25 | Oct 30 | Nov 13 | 206 |
| 28°F | Mar 25 | Apr 12 | Nov 9 | Nov 29 | 229 |
| 24°F | Mar 13 | Mar 31 | Nov 23 | Dec 13 | 254 |
32°F is the standard "freeze" line that damages tender crops; lighter 36°F frost can nip the most cold-sensitive plants, while hardy crops shrug off light frost down toward 28°F. Use the threshold that matches what you are protecting.
Growing degree days
Growing degree days (GDD) accumulate warmth above a base temperature over the year — a better predictor of crop development than the calendar alone. Warm-season crops need a long, warm GDD total; a short, cool GDD total favors greens and brassicas.
| Model | °F·days | Used for |
|---|---|---|
| Base 50°F (warm-season) | 4,444 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 7,201 | cool-season crops (brassicas, greens) |
Hardiness zone 7a
Somerset sits in USDA plant hardiness zone 7a on the 2023 map — meaning its average annual extreme minimum winter temperature is about 0 to 5 °F. That number tells you which perennials, shrubs, and trees reliably survive an average winter here; it does not set your planting dates, which come from the frost calendar above.
Explore more places in zone 7a, or see all USDA hardiness zones.
Frequently asked questions
- What USDA hardiness zone is Somerset?
- Somerset, Kentucky is in USDA plant hardiness zone 7a on the 2023 map (average annual extreme minimum temperature 0 to 5 °F) — from the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. See the methodology page for sources.
- When is the last frost in Somerset?
- The average (median) last spring frost at 32°F is around April 5, from NOAA's 1991–2020 climate normals at the nearest reporting station. Roughly one year in ten the last frost is as late as April 25, so wait until then before setting out frost-tender plants if you want to be safe.
- When is the first fall frost in Somerset?
- The average first fall frost at 32°F is around October 30. That leaves a growing season of about 206 days between the average last spring and first fall frosts.
- When should I start tomatoes in Somerset?
- Start tomato seeds indoors about Feb 8 – Feb 22 and transplant them outside about Apr 12 – Apr 19, once the danger of frost has passed. Estimated first harvest is around Jun 11 – Jul 1.
- How long is the growing season in Somerset?
- About 206 days at the 32°F threshold (NOAA 1991–2020, median) — the span between the average last spring frost (~April 5) and the average first fall frost (~October 30). Cold-hardy crops extend usable time at both ends; frost-tender crops fit inside it.
Sources & method
Frost, freeze, growing-season, and growing-degree-day figures are NOAA NCEI U.S. Climate Normals 1991–2020 for station USC00157510 (Somerset 2 N, 5.4 km away). The hardiness zone is the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. Planting windows are computed by counting from the average last and first frost using per-crop offsets synthesized from U.S. Cooperative Extension guides — the full method and citations are on the methodology page.