When to plant Lettuce in Mercer County, Ohio, United States
Lettuce can be planted after April 28, when air temperature is consistently in a range between 32°F and 75°F and soil temperature is above 45°F.
Growing Lettuce in Mercer County
Days suitable for growing Lettuce in Mercer County, Ohio
Mercer County has on average 39 continious days, suitable for growing Lettuce. Lettuce needs on average between 30 and 70 days to mature and produce harvest.
Growing season for Lettuce in Mercer County is quite short, with only 39 continious days suitable for growing, so it is really important to time your planting activities, and choose varieties with shorter time to harvest requirements.
Lettuce seeds can be planted between April 28 and May 06. Planting before April 28 without any additional protection is not advised because cold streaks can damage or kill off young plant. When planting after May 06, Lettuce will not have enough time to mature and produce harvest.
Growing season extention
In order to maximize chances for a good harvest of Lettuce in Mercer County, some extra steps can be taken to extend growing season.
Start seeds indoors
When starting seeds indoors, it is possible to guarantee best possible conditions for young seedlings. Consistent temperature range, adequate watering and ample light (natural, supplemented with artifitial grow lights) will ensure you have strong and healthy seedlings just in time for transplanting into soil.
It takes 20 days on average for Lettuce to sprout, and grow big enough to be ready for transplanting.
Mercer County has 2 distinct seasons for growing Lettuce
In order to get plants ready for April 28 seeds should be started indoors bwetween April 08 and May 06
Seeds started after May 06 are not likely to mature and produce harvest.
This Lettuce growing season in Mercer County is quite short, with only 39 days suitable for growth so it is really important to time your planting activities, and choose varieties with shorter time to harvest requirements.
In order to get plants ready for September 22 seeds should be started indoors bwetween September 02 and September 17
Seeds started after September 17 are not likely to mature and produce harvest.
This Lettuce growing season in Mercer County is quite short, with only 26 days suitable for growth so it is really important to time your planting activities, and choose varieties with shorter time to harvest requirements.
Use a cold frame
When using a cold frame in a beggining of growing season You can protect young plants from possible temperature drops, this way growing season can start up to 2 weeks earlier.
Use an additional shading
On days, when air temperatures are expected to raise above 75°F, which is in top of tolerable range for Lettuce, consider using additional shading to prevent heat shock.
| Total frost free days | 174 |
| Last frost expected date | May 10 |
| First frost expected date | October 31 |
| Dates with ideal conditions | May 16 to May 17 (2 days) May 21 to May 22 (2 days) September 25 September 29 October 04 to October 06 (3 days) October 11 to October 12 (2 days) October 24 |
| Dates with suitable conditions | April 05 to April 06 (2 days) April 08 to April 09 (2 days) April 12 to April 14 (3 days) April 24 to April 25 (2 days) April 28 to June 05 (39 days) June 07 to June 17 (11 days) June 19 to June 20 (2 days) June 22 to June 23 (2 days) August 15 August 31 September 06 to September 09 (4 days) September 12 to September 13 (2 days) September 15 September 18 to September 20 (3 days) September 22 to October 17 (26 days) October 19 to October 31 (13 days) November 07 November 10 to November 11 (2 days) |
| Total days ideal for growing Lettuce in Mercer County | 12 |
| Total days suitable for growing Lettuce in Mercer County | 117 |
| Days needed for Lettuce to mature and produce harvest | 30 - 70 |
| Seed can be planted directly into soil | no |
| Seed has to be started indoors | yes |
Notable temperature facts for growing Lettuce in Mercer County, Ohio
Table with days suitable to grow vegetables in Mercer County, Ohio
Tolerable temperature range for Lettuce: 32°F to 75°F
| Week | Average temperature | Possible min and max temperature | Suitable for Lettuce | |
|---|---|---|---|---|
| 1 | January 01 - January 03 | 33°F to 44°F | 19°F to 58°F | TRUE |
| 2 | January 04 - January 10 | 28°F to 39°F | 9°F to 55°F | |
| 3 | January 11 - January 17 | 28°F to 38°F | 16°F to 60°F | |
| 4 | January 18 - January 24 | 22°F to 34°F | -12°F to 53°F | |
| 5 | January 25 - January 31 | 19°F to 31°F | -8°F to 41°F | |
| 6 | February 01 - February 07 | 23°F to 38°F | 7°F to 58°F | |
| 7 | February 08 - February 14 | 22°F to 36°F | 6°F to 57°F | |
| 8 | February 15 - February 21 | 23°F to 39°F | 3°F to 60°F | |
| 9 | February 22 - February 28 | 28°F to 43°F | 13°F to 62°F | |
| 10 | March 01 - March 07 | 29°F to 47°F | 11°F to 67°F | |
| 11 | March 08 - March 14 | 33°F to 49°F | 18°F to 65°F | TRUE |
| 12 | March 15 - March 21 | 33°F to 50°F | 19°F to 65°F | TRUE |
| 13 | March 22 - March 28 | 36°F to 52°F | 20°F to 66°F | TRUE |
| 14 | March 29 - April 04 | 36°F to 54°F | 22°F to 68°F | TRUE |
| 15 | April 05 - April 11 | 43°F to 61°F | 29°F to 73°F | TRUE |
| 16 | April 12 - April 18 | 40°F to 58°F | 25°F to 73°F | TRUE |
| 17 | April 19 - April 25 | 40°F to 57°F | 23°F to 75°F | TRUE |
| 18 | April 26 - May 02 | 44°F to 60°F | 31°F to 74°F | TRUE |
| 19 | May 03 - May 09 | 46°F to 62°F | 35°F to 73°F | TRUE |
| 20 | May 10 - May 16 | 46°F to 64°F | 29°F to 77°F | TRUE |
| 21 | May 17 - May 23 | 54°F to 69°F | 39°F to 79°F | TRUE |
| 22 | May 24 - May 30 | 56°F to 72°F | 42°F to 79°F | TRUE |
| 23 | May 31 - June 06 | 56°F to 73°F | 44°F to 82°F | TRUE |
| 24 | June 07 - June 13 | 58°F to 73°F | 48°F to 81°F | TRUE |
| 25 | June 14 - June 20 | 58°F to 74°F | 49°F to 87°F | TRUE |
| 26 | June 21 - June 27 | 61°F to 76°F | 50°F to 86°F | |
| 27 | June 28 - July 04 | 63°F to 79°F | 50°F to 85°F | |
| 28 | July 05 - July 11 | 64°F to 78°F | 56°F to 85°F | |
| 29 | July 12 - July 18 | 64°F to 77°F | 58°F to 82°F | |
| 30 | July 19 - July 25 | 64°F to 78°F | 55°F to 85°F | |
| 31 | July 26 - August 01 | 63°F to 77°F | 56°F to 83°F | |
| 32 | August 02 - August 08 | 61°F to 76°F | 51°F to 83°F | |
| 33 | August 09 - August 15 | 62°F to 76°F | 52°F to 84°F | |
| 34 | August 16 - August 22 | 61°F to 76°F | 51°F to 82°F | |
| 35 | August 23 - August 29 | 63°F to 78°F | 53°F to 85°F | |
| 36 | August 30 - September 05 | 61°F to 75°F | 51°F to 83°F | TRUE |
| 37 | September 06 - September 12 | 59°F to 74°F | 51°F to 83°F | TRUE |
| 38 | September 13 - September 19 | 57°F to 74°F | 48°F to 83°F | TRUE |
| 39 | September 20 - September 26 | 55°F to 71°F | 42°F to 84°F | TRUE |
| 40 | September 27 - October 03 | 54°F to 70°F | 41°F to 83°F | TRUE |
| 41 | October 04 - October 10 | 49°F to 66°F | 36°F to 79°F | TRUE |
| 42 | October 11 - October 17 | 48°F to 63°F | 37°F to 75°F | TRUE |
| 43 | October 18 - October 24 | 46°F to 60°F | 34°F to 72°F | TRUE |
| 44 | October 25 - October 31 | 45°F to 56°F | 27°F to 70°F | TRUE |
| 45 | November 01 - November 07 | 39°F to 54°F | 26°F to 69°F | TRUE |
| 46 | November 08 - November 14 | 37°F to 52°F | 5°F to 70°F | TRUE |
| 47 | November 15 - November 21 | 33°F to 46°F | 18°F to 62°F | TRUE |
| 48 | November 22 - November 28 | 33°F to 46°F | 19°F to 56°F | TRUE |
| 49 | November 29 - December 05 | 32°F to 44°F | 20°F to 55°F | |
| 50 | December 06 - December 12 | 32°F to 44°F | 19°F to 61°F | TRUE |
| 51 | December 13 - December 19 | 30°F to 40°F | 10°F to 58°F | |
| 52 | December 20 - December 26 | 29°F to 43°F | -4°F to 59°F | |
| 53 | December 27 - December 31 | 33°F to 45°F | 17°F to 60°F | TRUE |
Days with suitable temperature for growing Lettuce in Mercer County, Ohio
All data is provided “as is” without warranty or any representation of accuracy, timeliness or completeness.
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Average daily temperatures were calculated using
