When to plant Broccoli in Boone County, Iowa, United States
Broccoli can be planted after April 27, when air temperature is consistently in a range between 28°F and 80°F and soil temperature is above 45°F.
Growing Broccoli in Boone County
Days suitable for growing Broccoli in Boone County, Iowa
Boone County has on average 68 continious days, suitable for growing Broccoli. Broccoli needs on average between 50 and 150 days to mature and produce harvest.
Growing season for Broccoli in Boone County is quite short, with only 68 continious days suitable for growing, so it is really important to time your planting activities, and choose varieties with shorter time to harvest requirements.
Broccoli seeds can be planted between April 27 and May 14. Planting before April 27 without any additional protection is not advised because cold streaks can damage or kill off young plant. When planting after May 14, Broccoli will not have enough time to mature and produce harvest.
Growing season extention
In order to maximize chances for a good harvest of Broccoli in Boone 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 49 days on average for Broccoli to sprout, and grow big enough to be ready for transplanting.
Boone County has 2 distinct seasons for growing Broccoli
In order to get plants ready for April 27 seeds should be started indoors bwetween March 09 and May 14
Seeds started after May 14 are not likely to mature and produce harvest.
This Broccoli growing season in Boone County is quite short, with only 68 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 August 30 seeds should be started indoors bwetween July 12 and August 27
Seeds started after August 27 are not likely to mature and produce harvest.
This Broccoli growing season in Boone County is quite short, with only 48 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 80°F, which is in top of tolerable range for Broccoli, consider using additional shading to prevent heat shock.
| Total frost free days | 172 |
| Last frost expected date | April 28 |
| First frost expected date | October 17 |
| Dates with ideal conditions | |
| Dates with suitable conditions | April 23 April 27 to July 03 (68 days) July 06 to July 18 (13 days) July 21 to July 25 (5 days) July 29 July 31 to August 09 (10 days) August 12 to August 18 (7 days) August 20 to August 22 (3 days) August 30 to October 16 (48 days) October 18 to October 21 (4 days) October 23 to October 24 (2 days) November 09 to November 10 (2 days) |
| Total days ideal for growing Broccoli in Boone County | 0 |
| Total days suitable for growing Broccoli in Boone County | 164 |
| Days needed for Broccoli to mature and produce harvest | 50 - 150 |
| Seed can be planted directly into soil | no |
| Seed has to be started indoors | yes |
Notable temperature facts for growing Broccoli in Boone County, Iowa
Table with days suitable to grow vegetables in Boone County, Iowa
Tolerable temperature range for Broccoli: 28°F to 80°F
| Week | Average temperature | Possible min and max temperature | Suitable for Broccoli | |
|---|---|---|---|---|
| 1 | January 01 - January 03 | 18°F to 33°F | -1°F to 46°F | |
| 2 | January 04 - January 10 | 21°F to 35°F | 0°F to 51°F | |
| 3 | January 11 - January 17 | 23°F to 35°F | -5°F to 50°F | |
| 4 | January 18 - January 24 | 13°F to 26°F | -17°F to 38°F | |
| 5 | January 25 - January 31 | 9°F to 24°F | -20°F to 35°F | |
| 6 | February 01 - February 07 | 13°F to 30°F | -14°F to 49°F | |
| 7 | February 08 - February 14 | 13°F to 28°F | -13°F to 51°F | |
| 8 | February 15 - February 21 | 13°F to 32°F | -19°F to 56°F | |
| 9 | February 22 - February 28 | 19°F to 35°F | -3°F to 58°F | |
| 10 | March 01 - March 07 | 24°F to 43°F | -5°F to 61°F | |
| 11 | March 08 - March 14 | 30°F to 45°F | 10°F to 69°F | TRUE |
| 12 | March 15 - March 21 | 31°F to 48°F | 11°F to 65°F | TRUE |
| 13 | March 22 - March 28 | 34°F to 49°F | 21°F to 65°F | TRUE |
| 14 | March 29 - April 04 | 34°F to 54°F | 22°F to 72°F | TRUE |
| 15 | April 05 - April 11 | 40°F to 60°F | 23°F to 73°F | TRUE |
| 16 | April 12 - April 18 | 36°F to 54°F | 21°F to 75°F | TRUE |
| 17 | April 19 - April 25 | 40°F to 59°F | 23°F to 74°F | TRUE |
| 18 | April 26 - May 02 | 44°F to 62°F | 28°F to 80°F | TRUE |
| 19 | May 03 - May 09 | 46°F to 63°F | 36°F to 83°F | TRUE |
| 20 | May 10 - May 16 | 49°F to 66°F | 32°F to 82°F | TRUE |
| 21 | May 17 - May 23 | 52°F to 67°F | 39°F to 79°F | TRUE |
| 22 | May 24 - May 30 | 54°F to 70°F | 37°F to 81°F | TRUE |
| 23 | May 31 - June 06 | 57°F to 75°F | 46°F to 83°F | TRUE |
| 24 | June 07 - June 13 | 59°F to 76°F | 46°F to 87°F | TRUE |
| 25 | June 14 - June 20 | 61°F to 79°F | 54°F to 91°F | TRUE |
| 26 | June 21 - June 27 | 61°F to 76°F | 50°F to 83°F | TRUE |
| 27 | June 28 - July 04 | 64°F to 80°F | 56°F to 85°F | TRUE |
| 28 | July 05 - July 11 | 63°F to 78°F | 50°F to 85°F | TRUE |
| 29 | July 12 - July 18 | 62°F to 78°F | 52°F to 88°F | TRUE |
| 30 | July 19 - July 25 | 64°F to 80°F | 55°F to 89°F | TRUE |
| 31 | July 26 - August 01 | 64°F to 80°F | 55°F to 88°F | TRUE |
| 32 | August 02 - August 08 | 62°F to 78°F | 52°F to 88°F | TRUE |
| 33 | August 09 - August 15 | 62°F to 78°F | 54°F to 84°F | TRUE |
| 34 | August 16 - August 22 | 61°F to 78°F | 53°F to 89°F | TRUE |
| 35 | August 23 - August 29 | 65°F to 80°F | 54°F to 92°F | TRUE |
| 36 | August 30 - September 05 | 60°F to 76°F | 52°F to 88°F | TRUE |
| 37 | September 06 - September 12 | 57°F to 73°F | 45°F to 87°F | TRUE |
| 38 | September 13 - September 19 | 58°F to 74°F | 45°F to 81°F | TRUE |
| 39 | September 20 - September 26 | 55°F to 72°F | 45°F to 85°F | TRUE |
| 40 | September 27 - October 03 | 55°F to 71°F | 38°F to 83°F | TRUE |
| 41 | October 04 - October 10 | 49°F to 65°F | 36°F to 79°F | TRUE |
| 42 | October 11 - October 17 | 44°F to 59°F | 31°F to 76°F | TRUE |
| 43 | October 18 - October 24 | 43°F to 58°F | 26°F to 77°F | TRUE |
| 44 | October 25 - October 31 | 35°F to 49°F | 22°F to 67°F | TRUE |
| 45 | November 01 - November 07 | 37°F to 54°F | 18°F to 69°F | TRUE |
| 46 | November 08 - November 14 | 34°F to 48°F | 8°F to 66°F | TRUE |
| 47 | November 15 - November 21 | 32°F to 48°F | 17°F to 63°F | TRUE |
| 48 | November 22 - November 28 | 28°F to 43°F | 15°F to 54°F | |
| 49 | November 29 - December 05 | 29°F to 43°F | 16°F to 58°F | TRUE |
| 50 | December 06 - December 12 | 26°F to 40°F | 15°F to 56°F | |
| 51 | December 13 - December 19 | 22°F to 36°F | 7°F to 66°F | |
| 52 | December 20 - December 26 | 23°F to 38°F | -10°F to 54°F | |
| 53 | December 27 - December 31 | 24°F to 36°F | -5°F to 48°F |
Days with suitable temperature for growing Broccoli in Boone County, Iowa
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
