When to plant Rhubarb in Multnomah County, Oregon, United States

Rhubarb can be planted after May 09, when air temperature is consistently in a range between 40°F and 80°F and soil temperature is above 45°F.

Growing Rhubarb in Multnomah County

Rhubarb needs on average between 56 and 70 days to mature and produce harvest.

Multnomah County has 2 distinct seasons suitable for growing Rhubarb

• May 09 to July 19

  Rhubarb needs on average between 56 and 70 days to mature and produce harvest. With 72 suitable for growht, you can expect good harvest without too much effort if all planting activities are done in timely manner.

• August 19 to October 23

  This Rhubarb growing season in Multnomah County is quite short, with only 66 days suitable for growth so it is really important to time your planting activities, and choose varieties with shorter time to harvest requirements.

Planting Rhubarb in Multnomah County before May 09 without any additional protection is not advised because cold streaks can damage or kill off young plant.

Growing season extention

In order to maximize chances for a good harvest of Rhubarb in Multnomah 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 42 days on average for Rhubarb to sprout, and grow big enough to be ready for transplanting.

Multnomah County has 2 distinct seasons for growing Rhubarb

• In order to get plants ready for May 09 seeds should be started indoors bwetween March 28 and May 10

  Seeds started after May 10 are not likely to mature and produce harvest.

  Rhubarb needs on average between 56 and 70 days to mature and produce harvest. With 72 suitable for growth, you can expect good harvest without too much effort if all planting activities are done in timely manner.

• In order to get plants ready for August 19 seeds should be started indoors bwetween July 08 and August 14

  Seeds started after August 14 are not likely to mature and produce harvest.

  This Rhubarb growing season in Multnomah County is quite short, with only 66 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 Rhubarb, consider using additional shading to prevent heat shock.

Table with days suitable to grow vegetables in Multnomah County, Oregon