What to plant this week in Flagstaff, AZ
Flagstaff gardeners are navigating a brief, warm window in late spring where frost risk lingers until mid-April but early summer crops like zucchini and cucumbers thrive. This week is critical for moving peppers and beans into the ground while keeping an eye out for the sudden temperature drops typical of our high-desert valley.
The next 7 days
Flagstaff, AZGrowing in Flagstaff right now
- Wait until soil warms above 60°F before planting cold-sensitive seeds like okra, as our rocky mountain soils cool rapidly at night in April/May.
- Apply a thick layer of mulch immediately after transplanting tomatoes and peppers to conserve moisture against the dry air and protect roots from freezing overnight dips.
- Take advantage of our high elevation by starting succession plantings of bush beans now to catch two harvests before the July heat peaks.
- Monitor soil moisture closely; Flagstaff's rapid evaporation means frequent light watering is better than deep, infrequent soaking for young seedlings.
Sow this week
7 crops- Bush Bean
- Cucumber
- French Marigold
- Nasturtium
- Okra
- Yellow Summer Squash
- Zucchini
Transplant this week
Nothing is due to go out this week.
Harvest soon
58 crops- Anaheim (New Mexico) Pepper
- Banana Pepper
- Basil
- Beefsteak Tomato
- Beet
- Bell Pepper
- Borage
- Brussels Sprouts
- Bush Bean
- Cantaloupe
- Carrot
- Cayenne Pepper
- Cleome (Spider Flower)
- Cosmos
- Cowpea (Black-Eyed Pea)
- Cucumber
- Dahlia
- Edamame
- Eggplant
- Fennel
- Flour Corn
- French Marigold
- Garden Geranium (Zonal)
- Garden Verbena
- Garlic
- Honeydew Melon
- Jalapeño
- Lantana
- Lima Bean
- Malabar Spinach
- Marconi Pepper
- Nasturtium
- Okra
- Ornamental Sweet Potato Vine
- Parsley
- Parsnip
- Petunia
- Poblano Pepper
- Pole Bean
- Potato
- Roma Tomato
- Rutabaga
- Scallion (Bunching Onion)
- Scarlet Runner Bean
- Serrano Pepper
- Shiso (Japanese Basil)
- Snapdragon
- Summer Savory
- Sunflower
- Sweet Corn
- Thai Basil
- Tomatillo
- Tomato
- Vinca (Madagascar Periwinkle)
- Watermelon
- Yellow Summer Squash
- Zinnia
- Zucchini
Seasonal tips
- Succession sow bush beans every two weeks for a continuous harvest throughout summer.
- Mulch around established tomato and pepper plants to retain moisture as soil temperatures rise.
- Prune dead or diseased foliage from Brassicas like Brussels Sprouts and Kale to improve air circulation.
Pest & disease watch
- Aphid colonies are building on new growth of squash and bean plants as temperatures climb above 60°F.
- Late-season carrot rust fly activity remains high near the valley floor where recent rains have softened the soil.
- Watch for powdery mildew developing on tomato leaves if humidity spikes during our typical spring rain events.
Watering this week
Water deeply in the morning to encourage strong root growth while minimizing fungal disease risk.
Pinch back the tips of young Bush Bean plants if they are leggy to encourage bushier, more productive growth.
Flagstaff gardening questions
3Can I plant my zucchini seeds now in Flagstaff?
Yes, you can sow bush beans and summer squash like Yellow Summer Squash and Zucchini right now as the soil is warming. However, avoid transplanting established plants until after April 21 to ensure they survive any late frost events.
My pepper plants are stunted despite recent rain; should I fertilize them?
Hold off on heavy nitrogen fertilizer for a week to let roots recover from the wet soil, then apply a light feed once drainage improves. Our local sandy-loam mix drains quickly, so ensure you aren't washing away nutrients with heavy watering.
When can I harvest my homegrown tomatoes and peppers?
Many varieties like Roma Tomato and Jalapeño are ready for harvesting soon if they show full color and firmness. Continue checking daily as the first frost of October 17 will end the season for these heat-loving crops.
Other cities in zone 6a
12See the full zone 6a guide → · Plan your Flagstaff garden in SproutGuide →